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
Methicillin resistance in Staph. aureus is due to: 
Select and explain. 
A. 13-lactamase, B. MECA gene, C. AMPC gene, D. Porin develop
B: MECA gene
Answer: B: MECA gene 
Explanation: Ans. is. b. MECA gene