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.

Question: Does a 12-week exercise program performed during the second trimester prevent gestational diabetes in healthy pregnant women?
Answer: A 12-week exercise program undertaken during the second trimester of pregnancy did not reduce the prevalence of gestational diabetes in pregnant women with BMI in the normal range.
no