I'm learning Special Interrogative Sentence. In this kind of sentence interrogative pronouns can be used as subject complement. For example:
What's your father?

"what" is the subject complement. But I couldn't find a special interrogative sentence in which the single interrogative pronoun "which" is used as a subject complement and I don't know if there is this kind of sentences. Look at this one:
Which is your name?
"which" is the subject complement?

Please explain carefully. Thank you.
Who is your father?
What is an albatross?
Which is your hat?

The wh-words are all subject complements. Is there more you need to know?
Dear Teacher,

You're right about the first two sentences, but in the third sentence which is used as subject. There is a same structure like this:

Which is your?

In grammer books authers say "which" is subject.

So I think "which" cannot be used as subject complement in Special Interrogative Question? Could you find other correct sentences about it?
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I'm sorry, the sentence I write is:

Which is yours?
Who is your father?
What is an albatross?
Which is your hat?

The wh-words are all subject complements.
I'll stick to my original opinion, in spite of your grammar book.
Please explain why.
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They all have precisely the same structure and intent:

Who is your father?-- Your father is who (= the bald guy in the corner)
What is an albatross?-- An albatross is what (= a large seabird)
Which is your hat? -- Your hat is which (= the green one with the pheasant feather)

But I also can answer:

Which is your hat?

This is my hat.

Is which still complement? Could you give some examples of the same structure as Which is your hat when which is used as subject?
It depends on the context. Remember that the thing to be identified is the subject.

Several hats are on the table. You are going to be given one of the hats, but you don't know which one.

Which is my hat?
The green one with the purple trim (is yours).
is the subject. You have the description already: my hat. Whatever it is, it's going to be your hat. You are looking for that thing which is to be identified as your hat. (This is your hat could also be an answer here.)

Several objects are on the table: your shirts, your gloves, your umbrella, etc. One of them is your hat. You are blindfolded. You begin to try to identify the objects by picking them up and touching them. You are particularly interested in finding your hat among the objects.

Which is my hat?
Your hat is the object farthest to the right.
is the subject complement. The thing to be identified is your hat. What you need is the description that will pick it out from among other things that could be your hat.

[Note the differences in intonation. Note also the difficulty of setting up two contexts in such a way that the same question can have whichin two different functions! Emotion: smile I don't know of many situations where it is necessary to analyze the function ofwhich so closely. I'm wondering where it would make a difference grammatically, since the form of the word which does not change depending on its having one or the other of these functions.]

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