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: Do medical students ' clinical skills match their teachers ' expectations : survey at Zagreb University School of Medicine , Croatia?
Answer: Students' self-assessed level of clinical skills was lower than that expected by their teachers. Education during clinical rotations is not focused on acquiring clinical skills, and additional clinical skills' training has a positive influence on students' self-assessed level of clinical skills. There was no consensus among teachers on the required level of students' clinical skills.

Ex Output:
no

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 six-month overnight administration of intraperitoneal amino acids improve lean mass?
Answer: Reduction in the amount of glucose in the peritoneal dialysate and the addition of amino acids decreases, whereas continuous dialysis with overnight glucose increases upper body fat over a 6-month period. However, no changes in protein stores were observed with the addition of amino acids. Therefore overnight peritoneal dialysis with amino acids offers minor advantages to protein-malnourished patients on CAPD, but may be of benefit in overweight CAPD patients.

Ex Output:
no