Q: 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 complete elimination of reflux symptoms guarantee normalization of intraesophageal and intragastric pH in patients with gastroesophageal reflux disease ( GERD )?
Answer: Fifty percent of patients with GERD without BE continue to exhibit pathologic GERD and low intragastric pH despite PPI therapy that achieves complete reflux symptom control.
A:
no