Who is the liar?
Of three persons A, B and C, one always lies while the others always speak the truth.
C asked A," Do you always speak the truth, Yes or No?" He said something that C could not hear.
So, C asked B," what did A say?" B replied," A say No".
So who's the liar?
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In my opinion, the correct answer is 'cannot be determined'. This is because the 'truth/lie telling' of the third person is not specified in the question.
However, as C is the one asking questions, if we assume that one of A and B is a liar and the other always tells the truth, the following logic comes.
Regardless of being a liar/truth-teller, A would have answered 'Yes' to the question. " Do you always speak the truth, Yes or No?"
However, B replies " A say No".
Hence, B is the liar.
BUT there can be another scenario.
A sometimes tells the truth and sometimes lies. (He is the 'third' person). Hence he actually answered 'No' and B is a truth-teller and correctly repeated A's answer. In this case, C, who is asking the questions is the liar.