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
Dienes' phenomena is seen with -a) Proteus mirabilisb) Klebsiellac) Proteus vulgarisd) Providentiae) Morganella 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: None