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
Rat bite fever is caused by ? 
Select and explain. 
A. Spirillum major, B. Spirillum minor, C. Yersinia, D. Leptospira
B: Spirillum minor
Answer: B: Spirillum minor 
Explanation: None