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
About rickettsiae, all are true except - 
Select and explain. 
A. These are transmitted by ahropod vectors, B. Eschar is not seen in RMSF, C. Weil-Felix reaction may be diagnostic, D. Cephalosporins are drugs of choice
D: Cephalosporins are drugs of choice
Answer: D: Cephalosporins are drugs of choice 
Explanation: Ans. is 'd' i.e., Cephalosporins are drugs of choice . Tetracyclines (e.g., doxycycline are DOCs).