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: Radiology
[{'content': 'MC cancer due to Radiation : \nSelect and explain. \nA. Leukaemia, B. Bronchogenic Ca, C. Thyroid Ca, D. Breast cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e., Leukemia', 'role': 'assistant'}]