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: Is increasing exposure to antibody-stimulating proteins and polysaccharides in vaccines associated with risk of autism?
Answer: In this study of MCO members, increasing exposure to antibody-stimulating proteins and polysaccharides in vaccines during the first 2 years of life was not related to the risk of developing an ASD.
[EX A]: no

[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 second-look endoscopy associated with better clinical outcomes after gastric endoscopic submucosal dissection : a prospective , randomized , clinical trial analyzed on an as-treated basis?
Answer: Single-center analysis.
[EX A]:
no