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: Medicine
[{'content': 'In DNA transfer the vectors used from smallest to largest is: \nSelect and explain. \nA. Cosmids, Plasmids, Bacteriophage, B. Plasmids, Bacteriophage, Cosmids, C. Bacteriophage, Cosmides, Plasmids, D. Cosmids, Bacteriophage, Plasmids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Plasmid, bacteriophage, cosmid * Plasmid is smallest & most commonly used vectors * 1Kb = 1000 nucleotide long base Vector/ Vehicle- DNA DNA inse size (i.e. can accept DNA fragment of) Plasmid (PBR 322) 0.01 - 10 kb (smallest)(2 Bacteriophage (Lambda charon 4A) 10 -20 kb Cosmids 35 - 50 kb (largest)2', 'role': 'assistant'}]