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: Microbiology
Rickettsia tsutsugamushi is a small gram-negative, obligate intracellular organism causing 
Select and explain. 
A. Epidemic typhus, B. Endemic typhus, C. Scrub typhus, D. Q fever
C: Scrub typhus
Answer: C: Scrub typhus 
Explanation: Scrub typhus