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: Pharmacology
In a patient with Listeria meningitis who is allergic to penicillin, the antimicrobial of choice is ? 
Select and explain. 
A. Vancomycin, B. Gentamicin, C. Trimethoprim-sulphamethoxazole, D. Ceftriaxone
C: Trimethoprim-sulphamethoxazole
Answer: C: Trimethoprim-sulphamethoxazole 
Explanation: Ans. is 'c' i.e., Trimethoprim-sulphamethoxazole TIT of listeria monocytogenes meningitis Penicillin sensitive Ampicillin + Gentamicin Penicillin allergic Trimethoprim and Sulphamethoxazole.