This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'The main Side effect of Imatinib mesylate \nSelect and explain. \nA. Leg ulcers, B. Fluid retention, C. Flagellate hyperpigmentation, D. Irreversible myelosuppression', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The main side effects are fluid retention, nausea, muscle cramps, diarrhea, and skin rashes.', 'role': 'assistant'}]