Definition: 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 expression of multidrug resistance-related genes contribute to risk factors in newly diagnosed childhood acute lymphoblastic leukemia?
Answer: Expression (mRNA levels) of the MDR1, MRP and LRP genes did not contribute to risk factors in newly diagnosed childhood acute lymphoblastic leukemia.
Output:
no