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
Imatinib is used in the treatment of 
Select and explain. 
A. Chronic myelomonocytic leukemia, B. Myelodysplastic syndrome, C. Acute lymphoblastic leukemia, D. Gastrointestinal stromal tumors
D: Gastrointestinal stromal tumors
Answer: D: Gastrointestinal stromal tumors 
Explanation: Imatinib is used in the treatment of certain types of leukemia and gastrointestinal stromal tumors (GIST). 
This medication is also used to treat dermatofibrosarcoma protuberans, a type of skin tumor. Imatinib is a biologic drug, also known as targeted therapy.