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
In patient with listeria meningitis who is allergic to penicillin the treatment of choice is - 
Select and explain. 
A. Vancomycin, B. Gentamycin, C. Trimethoprim-sulphamethoxazole, D. Ceftriaxone
C: Trimethoprim-sulphamethoxazole
Answer: C: Trimethoprim-sulphamethoxazole 
Explanation: None