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: Is the covariation between burnout and sick leave due to mental disorders explained by a shared genetic liability : a prospective swedish twin study with a five-year follow-up?
Answer: The association between burnout and sick leave due to stress-related and other mental disorders seems to be a reflection of a shared genetic liability.
Example Output: yes

Example Input: Question: Do pre-admission clinical factors affect length of stay in the epilepsy monitoring unit?
Answer: Pre-admission clinical variables may predict EMU LOS. These factors could be used at the administrative level for maximum EMU resource utilization.
Example Output: yes

Example Input: Question: Are hER1-4 protein concentrations in normal breast tissue from breast cancer patients expressed by the same profile as in the malignant tissue?
Answer: We suggest that these findings indicate that breast cancer is a systemic disease where the HER1-4 system in autologous reference tissue is continuously activated, thus favoring the subsequent development of cancer.
Example Output:
yes