This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Anatomy
Polyvalent anti-snake venom is useful against all snakes except 
Select and explain. 
A. Russel's viper, B. Common krait, C. Saw scaled viper, D. King cobra
D: King cobra
Answer: D: King cobra 
Explanation: Polyvalent anti-snake venom It is given to neutralize the venom. The anti snake venom is prepared by hyperimmunising horses against four common poisonous snakes: cobra, common krait, Russell's viper, Saw scaled viper. The polyvalent anti-snake venom is not effective against bites by Banded krait, king cobra, pit vipers and sea snakes. ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 520