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
All are true about Rickettsia except - 
Select and explain. 
A. obligate intracellular, B. Gram +ve bacillus, C. Arthropods are vector, D. Weil felix test is diagnostic
B: Gram +ve bacillus
Answer: B: Gram +ve bacillus 
Explanation: None