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: Physiology
Least conduction velocity is seen in: 
Select and explain. 
A. AV node, B. Purkinje fibers, C. Bundle of His, D. Ventricular myocardial fibres
A: AV node
Answer: A: AV node 
Explanation: None