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': 'Crizotinib is used in the treatment of : \nSelect and explain. \nA. FLT-3 +ve Non small cell carcinoma of lung, B. ALK +ve Non small cell carcinoma of lung, C. FLT-3 +ve  Acute myeloid leukemia, D. BRCA-2 +ve metastatic breast carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Crizotinib inhibits anaplastic lymphoma kinase (ALK), hence used in ALK mutation positive non small cell carcinoma of lungs.', 'role': 'assistant'}]