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
Reservoir of plague is ? 
Select and explain. 
A. Domestic rat, B. Wild rat, C. Rat flea, D. Man
B: Wild rat
Answer: B: Wild rat 
Explanation: Ans. is 'b' i.e., Wild rat