This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 3, Subject name: Forensic Medicine
Which is true for krait? 
Select and explain. 
A. Pit present near the nostrils, B. 3rd supralabial large, C. 4th infra labial large, D. All of the above
C: 4th infra labial large
Answer: C: 4th infra labial large 
Explanation: Kraits : No pit third labial does not touch the nose and eye central row of scales on back enlarged. undersurface of the mouth has only four infralabials, the fouh being the largest.