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': 'Imatinib primarily acts by inhibiting : \nSelect and explain. \nA. BCR–ABL, B. Tyrosine Kinase, C. PGDFR, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]