This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Pharmacology
[{'content': 'Most common side effect of 5-fluorouracil is: \nSelect and explain. \nA. G.I. toxicity, B. Bone marrow depression, C. Cardiotoxicity, D. Neeurotoxicity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Ref: KDT 6/e p824; Harrison 16/e p596) Diarrhea is the most common adverse effect of 5-FU. It can also cause hand and foot syndrome and bone marrow suppression.', 'role': 'assistant'}]