question: Q:A 35-year-old woman with irritable bowel syndrome comes to the physician because of increased diarrhea. She has not had any fever, bloody stools, nausea, or vomiting. The increase in stool frequency began when she started a new job. She is started on loperamide, and her symptoms improve. Which of the following is the primary mechanism of action of this drug?? 
  {'A': 'μ-opioid receptor agonism', 'B': '5-HT3 receptor antagonism', 'C': 'Acetylcholine receptor antagonism', 'D': 'Physical protection of stomach mucosa', 'E': 'H2 receptor antagonism\n"'},