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
Which of the following is non poisoning snake? 
Select and explain. 
A. Viper, B. Krait, C. Sea snake, D. Rat snake
D: Rat snake
Answer: D: Rat snake 
Explanation: D i.e. Rat snake