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: Unknown
[{'content': 'Most sensitive investigation to see intracranial bleed in a patient with head injury - \nSelect and explain. \nA. MRI, B. X-ray, C. CT-scan, D. Ultrasound', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., CT-scan o Has been explained in previous session", 'role': 'assistant'}]