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 tolerance to the therapeutic effect of tadalafil occur during 6 months of treatment : A randomized , double-blind , placebo-controlled study in men with erectile dysfunction?
Answer: Tadalafil treatment significantly improved SEP3 and IIEF EF domain scores. The efficacy of tadalafil, taken as needed, was maintained over a 6-month treatment period in men with ED.
no