This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Weil -felix reaction positive with OXK antigen in - 
Select and explain. 
A. Trench fever, B. Scrub typhus, C. Endemic typhus, D. Epidemic typhus
B: Scrub typhus
Answer: B: Scrub typhus 
Explanation: Ans. is 'b' i.e., Scrub typhus Weil felix ReactionDiseaseOX-19OX-2OX-KRocky Mountain spotted fever++-Rickettsial pox---Epidemic typhus+--Bril - Zinsser disease+/---Scrub typhus--+Endemic typhus+--Trench fever--_Q fever---