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
[{'content': 'In patient with Listeria meningitidis who is allergic penicillin the treatment of choice is: \nSelect and explain. \nA. Vancomycin, B. Gentamycin, C. Trimethoprim - sulfamethoxazole, D. Ceftriaxone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Trimethoprim - sulfamethoxazole DOC for listeriosis (non-pregnant, neonate, pregnant) is ampicillin or penicillin often in combination with aminoglycosides. During last month of pregnancy (in case of penicillin allergy), may be treated with erythromycin. Otherwise in all cases of penicillin allergy DOC is trimethoprim-sulfamethoxazole', 'role': 'assistant'}]