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
Which of the following is seen in second degree AV block -a) Change in morphology of ventricular complexb) Increased atrial rate compared to ventricular ratec) Increase in cardiac outputd) Decrease in stroke volumee) Increased AV conduction time 
Select and explain. 
A. abc, B. bcd, C. abe, D. acd
C: abe
Answer: C: abe 
Explanation: None