<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old woman presents with severe diarrhea and abdominal pain. She says she has had 10 watery stools since the previous morning and is experiencing severe cramping in her abdomen. She reports similar past episodes of diarrhea with excruciating abdominal pain and mentions that she has taken diphenoxylate and atropine before which had helped her diarrhea and pain but resulted in severe constipation for a week. Which of the following receptors does diphenoxylate activate to cause the effects mentioned by this patient?? A: NK1 receptor, B: H2 receptor, C: 5-HT3 receptor, D: D2 receptor, E: μ receptor,  <response>: This is a clinical vignette about a 28-year-old woman with severe diarrhea and abdominal pain. She has a history of similar episodes in the past that were treated with diphenoxylate and atropine, which helped the diarrhea but caused constipation. The question is asking which receptor diphenoxylate activates to cause its effects. Based on the information provided, diphenoxylate helped relieve the patients diarrhea, indicating it has antidiarrheal properties. It also caused subsequent constipation, suggesting it has opioid-like effects. Of the answer choices provided, only the μ opioid receptor would explain both the antidiarrheal and constipating effects of diphenoxylate. The other receptors listed are not known to be activated by diphenoxylate or consistent with its described effects.E: μ receptor 