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: Forensic Medicine
Macewan's sign is seen in: 
Select and explain. 
A. Cyanide poisoning, B. Alcoholism, C. Lead, D. Arsenic poison
B: Alcoholism
Answer: B: Alcoholism 
Explanation: Alcoholism