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: Biochemistry
In DNA transfer the vectors used from smallest to largest is - 
Select and explain. 
A. Cosmids, Plasmids, Bacteriophage, B. Plasmids, Bacteriophage, Cosmids, C. Bacteriophage, Cosmides, Plasmids, D. Cosmids, Bacteriophage, Plasmids
B: Plasmids, Bacteriophage, Cosmids
Answer: B: Plasmids, Bacteriophage, Cosmids 
Explanation: None