This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The commonest side-effect of Cisapride is - \nSelect and explain. \nA. Abdominal cramps, B. Diarrhea, C. Headache, D. Convulsions', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Diarrhea Cisapride is a prokinetic agent and often produces loose stools (diarrhea is thus the commonest side effect)", 'role': 'assistant'}]