Definition: 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.
Input: Question: Does levonorgestrel butanoate intramuscular injection reliably suppress ovulation for 90 days in obese and normal-BMI women : a pilot study?
Answer: Return to ovulation was earlier than 6 months in both BMI groups but more so in the obese BMI group.
Output:
no