Detailed Instructions: 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.
Q: Question: Does spironolactone prevent acute mountain sickness : a prospective , double-blind , randomized , placebo-controlled trial by SPACE Trial Group ( spironolactone and acetazolamide trial in the prevention of acute mountain sickness group )?
Answer: Spironolactone (50 mg BID) was ineffective in comparison to acetazolamide (250 mg BID) in the prevention of AMS in partially acclimatized western trekkers ascending to 5000 m in the Nepali Himalaya.
A:
no