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
Transfer of drug resistance in Staphylococcus is by 
Select and explain. 
A. Transduction, B. Transformation, C. Conjugation, D. Transfection
A: Transduction
Answer: A: Transduction 
Explanation: Beta-lactamase(penicillinase) inactivates penicillin by splitting beta-lactam ring. Penicillinase is an inducible enzyme and its production is usually controlled by plasmids which are transmitted by transduction or conjugation.