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
The genetic ability of a bacterium to grow in the presence of several antibiotics is passed in vivo from one bacterium to another by: 
Select and explain. 
A. Conjugation, B. Rarefaction, C. Transduction, D. Transformation
A: Conjugation
Answer: A: Conjugation 
Explanation: None