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: Unknown
Weil-Felix reaction with OXK antigen indicates infection with 
Select and explain. 
A. R. tsustsugamushi, B. R. mooseri, C. R. quintana, D. R. akari
A: R. tsustsugamushi
Answer: A: R. tsustsugamushi 
Explanation: Weil-Felix reaction:
Serological diagnosis of Rickessial infection. Weil-Felix reaction is a Heterophile agglutination test. Antigens used are Nonmotile strains of Proteus vulgaris (OX 19, OX 2), Proteus mirabilis (OX K).
Mechanism: Proteus and Rickessiae will share alkali stable carbohydrate antigen will be basis of the Weil-Felix reaction. Weil-Felix is a tube agglutination test. It is a simple and useful test for the diagnosis. The Antibody rises in 2nd week of illness and reaches the peak and get decline rapidly during the course of convalescence.