M: The reflux disease is often caused by the relaxation of the sphincter which opens at the wrong time, allowing acid content to flow into the esophagus. What do you think is the result? W: It burns. That’s what causes heartburn, right? Q: What are they talking about? 事实细节题。题干为:这两个人在谈论什么?由文中“The reflux disease is often caused by the relaxation of the sphincter which opens at the wrong time, allowing acid content to flow into the esophagus.(反流性疾病通常是由于括约肌松弛引起的,括约肌在错误的时间打开,导致酸性物质流入食道。)”可知,他们在谈论的是“胃食管的反流性疾病”,所以C选项“A stomach problem(胃病)”符合原文。A选项“胸部病例”;B选项“神经紊乱”;D选项“精神疾病”不符合原文。