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
Man comes with head injury investigation of choice - 
Select and explain. 
A. CECT, B. X - ray, C. MRI, D. Plain CT
D: Plain CT
Answer: D: Plain CT 
Explanation: Ans. is 'd' i.e., Pain CT