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
The essential ingredient in the space sprays for vector control is – 
Select and explain. 
A. Malathion, B. Fenithion, C. Pyrethrum, D. BHC
C: Pyrethrum
Answer: C: Pyrethrum 
Explanation: None