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: Surgery
Which of the following is true about imatinib 
Select and explain. 
A. It acts by inhibition of tyrosine kinase, B. It is used to treat GIST, C. Side effect of imatinib is pedal edema, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None