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.

Ex Input:
Question: Does the usage of overtube have a favorable effect on endoscopic submucosal dissection?
Answer: We conclude that using an overtube during an upper gastrointestinal ESD decreases the need for suction, favors the speed of dissection, and eases the comfort of the procedure.

Ex Output:
yes


Ex Input:
Question: Does creatine supplementation affect kidney function in an animal model with pre-existing renal failure?
Answer: Creatine supplementation at a dosage of 2% w/w for 4 weeks does not impair kidney function in animals with pre-existing renal failure or in control animals.

Ex Output:
no


Ex Input:
Question: Is total laparoscopic resection for advanced gastric cancer safe and feasible in the Western population?
Answer: Following total laparoscopic resection for advanced gastric cancer, oncologic endpoints, postoperative course, and early cancer-specific follow-up are excellent. The results demonstrated here support the routine use of these techniques in the Western patient population.

Ex Output:

yes