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
Prophaylaxis for malaria not used- 
Select and explain. 
A. Doxycycline, B. Artesunate, C. Chloroquine, D. Mefloquine
B: Artesunate
Answer: B: Artesunate 
Explanation: None