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
The main Side effect of Imatinib mesylate 
Select and explain. 
A. Leg ulcers, B. Fluid retention, C. Flagellate hyperpigmentation, D. Irreversible myelosuppression
B: Fluid retention
Answer: B: Fluid retention 
Explanation: The main side effects are fluid retention, nausea, muscle cramps, diarrhea, and skin rashes.