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
Proteus isolated from a patient of UTI will show which boichemical reaction: 
Select and explain. 
A. Phenylpyruvic acid reaction, B. Bile esculin reaction, C. Colchicine sensitivity, D. Bacitracin sensitivity
A: Phenylpyruvic acid reaction
Answer: A: Phenylpyruvic acid reaction 
Explanation: Ans. is. 'a' i. e., Phenylpyruvic acid reaction