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 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.
[EX A]: no

[EX Q]: Question: Is radiological review of specimen radiographs after breast localisation biopsy always necessary?
Answer: This study shows that a suitably trained or experienced surgeon can assess specimen radiographs effectively without the need for intraoperative radiological input although complete histological resection is not guaranteed despite specimen radiographs demonstrating clear margins.
[EX A]: no

[EX Q]: Question: Does biolimus-eluting stent with biodegradable polymer improve clinical outcomes in patients with acute myocardial infarction?
Answer: BES, compared with SES, significantly improved safety and efficacy outcomes in patients with AMI, especially those with STEMI, at 5-year follow-up.
[EX A]:
yes