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
[{'content': 'Most powerful cloning vector ? \nSelect and explain. \nA. Plasmid, B. Virus, C. Cosmid, D. Phage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most powerful cloning vector is cosmid as largest DNA can be incorporated in cosmid.Overall, most powerful cloning vector is YAC (Yeast aificial chromosome).', 'role': 'assistant'}]