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 allelic variation in the D4 dopamine receptor ( DRD4 ) gene predict response to clozapine?
Answer: DRD4 alleles do not predict therapeutic response to clozapine in schizophrenic and schizoaffective patients. There are implications from these data for the pathophysiology of schizophrenia and the mechanism of clozapine's therapeutic effect are discussed.
Output:
no