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 Q]: Question: Does biofeedback-guided control of abdominothoracic muscular activity reduce regurgitation episodes in patients with rumination?
Answer: Rumination is produced by an unperceived somatic response to food ingestion that disrupts abdominal accommodation and can be effectively corrected by biofeedback-guided control of abdominothoracic muscular activity.
[EX A]: yes

[EX Q]: Question: Has survival after recurrent esophageal carcinoma improved over the past 18 years?
Answer: Survival after recurrent EC in patients who undergo FU without routine imaging after esophagectomy is approximately 3months and has not improved over the past 18years.
[EX A]: no

[EX Q]: Question: Is the PAS positive material in gastric cancer cells of signet ring type mucin?
Answer: The lack of MUC protein and mRNA in signet ring tumour cells suggests the amorphous substance is not mucin. The lack of MUC mRNA expression in non-signet ring tumour cells questions exocrine differentiation in this tumour group. The abundant protein expression of the general neuroendocrine markers CgA and synaptophysin, and mRNA expression in tumour cells strengthens the hypothesis that this tumour group may be of neuroendocrine origin.
[EX A]:
no