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
Mechanism of action of imatinib mesylate is : 
Select and explain. 
A. Increase in metabolism of P glycoprotein, B. Blocking the action of P glycoprotein, C. Blocks the action of chimeric fusion protein of bcr–abl, D. Non–competitive inhibition of ATP binding site
C: Blocks the action of chimeric fusion protein of bcr–abl
Answer: C: Blocks the action of chimeric fusion protein of bcr–abl 
Explanation: None