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.

Example Input: Question: Does the Drosophila Chmp1 protein determine wing cell fate through regulation of epidermal growth factor receptor signaling?
Answer: Drosophila Chmp1 negatively regulates DER signaling, likely through its role in MVB formation. Loss of Chmp1 activity in the Drosophila wing induces a cell fate change from intervein to vein that should provide a useful tool for future studies of ESCRT protein activity.
Example Output: yes

Example Input: Question: Is preoperative prolonged steroid use associated with intraoperative blood transfusion in noncardiac surgical patients?
Answer: The effect of prolonged steroid use on bleeding, if any, thus seems likely to be small and is probably of limited clinical consequence. In contrast, corticosteroid use augments the risk of both systemic and wound infections.
Example Output: no

Example Input: Question: Is stromal cell-derived factor-1-3 ' A polymorphism associated with decreased risk of myocardial infarction and early endothelial disturbance?
Answer: SDF1-3'A polymorphism is associated with a decreased risk of MI and early endothelial dysfunction, strongly confirming the important atherogenic role of SDF1 gene at clinical level.
Example Output:
yes