This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
If the head of the snake has small scales covering the whole surface of the head it indicates 
Select and explain. 
A. Viper, B. Cobra, C. Krait, D. Non venomous
A: Viper
Answer: A: Viper 
Explanation: All poisonous snakes have small head scales except cobra, krait & pit viper. These three snakes can be identified by 1. Pit viper: pit below the eye 2. Cobra: 3rd labial touches eye and nasal shields 3. Krait: 4 infralabial scales below mouth & 4th being largest Russel viper