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
Rickettsial agent of Epidemic typhus isRickettsial agent of Epidemic typhus is 
Select and explain. 
A. R. canorii, B. R. typhi, C. R. tsutsugamushi, D. R. prowazekii
D: R. prowazekii
Answer: D: R. prowazekii 
Explanation: None