This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Regarding Proteus, which is true? \nSelect and explain. \nA. Musty odour, B. Most common infection caused is respiratory tract infection, C. PPA test positive, D. Esthiomene is a complication in females', 'role': 'user'}, {'content': "Answer: C \nExplanation: Proteus shows PPA test positive. Proteus: Odor: Putrid 'fishy' or 'seminal' odour. Most common clinical manifestation-UTI (Urinary tract infection). Phenylalanine Deaminase test/ phenylpyruvic acid (PPA test): Tests the ability of an organism to produce enzyme deaminase. PPA test +ve - conves phenylalanine to phenylpyruvic acid. Used to differentiate Proteus, Morganella and Providencia (Positive) from other members of Enterobacteriaceae (PPA negative). Esthiomene is a genital elephantiasis- seen in Lymphogranuloma venereumcaused by Chlamydia trachomatis serovars L1, L2, or L3.", 'role': 'assistant'}]