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
Who invented PCR 
Select and explain. 
A. Alec Jeffrey, B. Karry mullis, C. Cesar milstein, D. Gall and Pardue
B: Karry mullis
Answer: B: Karry mullis 
Explanation: Refer the byte " PCR".