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.

[EX Q]: Question: Does three-dimensional assessment of ultrasound features in women with clomiphene citrate-resistant polycystic ovarian syndrome ( PCOS ) : ovarian stromal volume correlate with biochemical indices?
Answer: These findings demonstrate an association of the total ovarian volume, pre-antral follicle number and total follicular volume with some of the biochemical indices of PCOS, but no association was observed between ovarian stromal volume and these indices.
[EX A]: no

[EX Q]: Question: Are mannose-binding lectin polymorphisms associated with rheumatoid arthritis -- confirmation in two large cohorts?
Answer: MBL genotype groups are not associated with RA disease susceptibility or severity in this large study including a confirmation cohort. Compared with previous smaller studies these results add to more definite conclusions.
[EX A]: no

[EX Q]: Question: Is dysfunctional coping in headache : avoidance and endurance associated with chronic forms of headache?
Answer: Dysfunctional coping was seen with high prevalence in the entire patient sample (66%). Against our hypothesis, it was not confined to chronic forms of headache. In respect to our data, we discuss the role of avoidance and endurance coping in headache and its possible role in chronicity.
[EX A]:
no