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
When P-R interval in a bipolar limb lead Electrocardiograph prolongs beyond 0.20 seconds the patient has 
Select and explain. 
A. Third degree complete block, B. Second degree Type 2 block, C. First degree complete block, D. Second degree incomplete block
C: First degree complete block
Answer: C: First degree complete block 
Explanation: None