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
Normal PQ interval is - 
Select and explain. 
A. 0.12 sec., B. 0.2 sec., C. 0.16 sec., D. 0.016 sec.
C: 0.16 sec.
Answer: C: 0.16 sec. 
Explanation: None