This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head Injury, Subject name: Surgery
[{'content': 'Man comes with head injury investigation of choice - \nSelect and explain. \nA. CECT, B. X - ray, C. MRI, D. Plain CT', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Pain CT", 'role': 'assistant'}]