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': 'Who invented PCR \nSelect and explain. \nA. Alec Jeffrey, B. Karry mullis, C. Cesar milstein, D. Gall and Pardue', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Refer the byte " PCR".', 'role': 'assistant'}]