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
DDT is a: March 2013 (a, h) 
Select and explain. 
A. Contact poison, B. Hemolytic poison, C. Muscle poison, D. Stomach poison
A: Contact poison
Answer: A: Contact poison 
Explanation: Ans. A i.e. Contact poison DDT/ dichlorodiphenyltrichloroethane It is an organochlorine insecticide which is a colorless, crystalline solid, tasteless and almost odorless chemical compound. The Swiss chemist Paul Hermann Muller was awarded the Nobel Prize in Physiology or Medicine in 1948 "for his discovery of the high efficiency of DDT as a contact poison against several ahropods."