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: Social & Preventive Medicine
Following is a contact poison- 
Select and explain. 
A. BHC, B. BaSO4, C. A + B of above, D. Paris green
A: BHC
Answer: A: BHC 
Explanation: Ans. is 'a' i.e., BHC Benzemene hexachloride (BHC) or Hexachlorocyclo-hexane (HCH) is a contact poison.