Instructions: Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.
Input: Question: Does host resistance explain variation in incidence of male-killing bacteria in Drosophila bifasciata?
Answer: The absence of the infection from the Hokkaido population is not caused by failure of the male-killer to function on the Hokkaido genetic background.
Output:
no