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.

Example Input: Question: Is multivitamin-mineral supplementation as efficacious as is iron supplementation in improving hemoglobin concentrations in nonpregnant anemic women living in Mexico?
Answer: MM supplements may not be as efficacious as is iron alone in improving the hemoglobin status of anemic women.
Example Output: no

Example Input: Question: Does patient-prosthesis mismatch in patients undergoing bioprosthetic aortic valve implantation increase risk of reoperation for structural valve deterioration?
Answer: Patients suffering from mismatch were twice as likely to undergo reoperation for aortic bioprosthesis replacement for SVD than those without mismatch.
Example Output: yes

Example Input: Question: Does activation of microbubbles by low-level therapeutic ultrasound enhance the antitumor effects of doxorubicin?
Answer: MB-US could increase the susceptibility of tumours to antineoplastic drugs, suggesting a potential clinical method for US-mediated tumour chemotherapy.
Example Output:
yes