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: Surgery
Brain abscess may be due to following? 
Select and explain. 
A. Chronic suppurative otitis media, B. Chronic lung abscess, C. Trauma, D. Any of the above
D: Any of the above
Answer: D: Any of the above 
Explanation: Ans. is 'd' i.e., Any of the above