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
MacEwen's sign is seen in: 
Select and explain. 
A. Lead poisoning, B. Arsenic poisoning, C. Ethanol poisoning, D. Copper poisoning
C: Ethanol poisoning
Answer: C: Ethanol poisoning 
Explanation: MacEwen signs (MacEwen pupil) The pupil of a patient comatose from alcohol intoxication dilates briefly when the patient is stimulated but not awakened, while that of a patient comatose from structural disease does not get dilated for mild stimulation. Ref: Principles of forensic medicine, Apurva nandy, 3rd Edition,Page 847.