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
If sodium channel inactivation is prolonged then which property of nerve conduction is hampered? 
Select and explain. 
A. Decreased relative refractory period, B. Increased conduction blockade, C. Increased upward stroke velocity, D. Decreased downward stroke velocity of refractory period.
C: Increased upward stroke velocity
Answer: C: Increased upward stroke velocity 
Explanation: None