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: Are front-of-pack symbols a reliable indicator of products with healthier nutrient profiles?
Answer: FOP symbols are being used to market foods that are no more nutritious than foods without this type of marketing. Because FOP symbols may influence consumer perceptions of products and their purchases, it may be a useful public health strategy to set minimum nutritional standards for products using FOP symbol marketing.
Example Output: no

Example Input: Question: Is chronic cerebrospinal venous insufficiency associated with chronic venous disorders : A case-control study?
Answer: We found no association of CCSVI with the presence of CVD or family history of varicose veins.
Example Output: no

Example Input: Question: Does anti-rat ICAM-1 antibody influence the course of experimental melanin-induced uveitis?
Answer: We were unable to demonstrate an inhibitory effect of anti-rat ICAM-1 antibody on the outcome of EMIU. Our observations may reflect a redundancy in the adhesion molecule profile responsible for this uveitis.
Example Output:
no