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Living conditions in a poor village are obviously unhygienic, ---- life in a sophisticated city is also potentially dangerous.

A) since
B) but
C) as
D) moreover
E) even though

Which one is right?
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Mr. Smith can run very fast even though he is 40 years old. (Despite being old, Mr. Smith can run very fast).

Boys can run fast, but some girls can dash just as fast. (Clause A is true, but potentially Clause B can also be true)

Living conditions in poor villages are unhygienic ____ life in a city is potentially dangerous. (A is ture, but B is potentially true too).

So as Erin stated, the only logical fit here is 'but'.
Comments  
"But" is the only word that would make sense. It means "contary to expectation", and it's introducing a clause that is partially negating the idea set up in the first clause, that being that life in a sophisticated city would be easier and safer in comparison to life in a poor village.
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How can you explain why "even though" is not right?
Clause A even though Clause B == Clause A is true despite Clause B.

Living conditions in a poor village are obviously unhygienic, even though life in a sophisticated city is also potentially dangerous.

This sentence is saying that life in a sophisticated city being potentially dangerous should be making the living conditions in a poor village hygenic, but for some reason isn't. That obviously doesn't make sense.

That's how I see it, anyway. I'm not a grammarian.
 Danyoo's reply was promoted to an answer.
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