Can you tell me what the answer is, so that I can respond to the client?
Is the punctuation mark correct? It just feels as if the subordinate clause becomes a question as well.
fold scarf 101ell me what the answer is, so that I can respond to the client?
Please tell me what the answer is so that I can respond to the client. (This is a declarative statement.)
Can you tell me what the answer is so that I can respond to the client? (This is a question.)
Comments
The comma after "is" is redundant.
The subordinate clause what the answer is, embedded in the direct question, is the interrogative subordinate clause, also called indirect question.
(I'm not a native.)
Can you tell me what the answer is, so that I can respond to the client?
Yes, the whole sentence is an interrogative (question). The comma is optional.
Within the sentence is the subordinate interrogative clause (embedded question) "what the answer is".
The meaning is:
"Can you tell me the answer to the question 'What is the answer?' so that I can respond to the client?"