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 tobacco smoking associated with decreased semen quality?
Answer: Results demonstrated a decline in semen quality in a dose dependent tobacco smoking manner.
Example Output: yes

Example Input: Question: Does short-term , high-dose glucocorticoid treatment contribute to reduced bone mineral density in patients with multiple sclerosis?
Answer: Reduced BMD was prevalent in patients with MS. GC treatment appears not to be the primary underlying cause of secondary osteoporosis in MS patients.
Example Output: no

Example Input: Question: Is subcortical atrophy associated with cognitive impairment in mild Parkinson disease : a combined investigation of volumetric changes , cortical thickness , and vertex-based shape analysis?
Answer: Patients with Parkinson disease with mild cognitive impairment demonstrated reduced subcortical volumes, which were associated with cognitive deficits. The thalamus, nucleus accumbens, and putamen may serve as potential biomarkers for Parkinson disease-mild cognitive impairment.
Example Output:
yes