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
Axonal transport is: 
Select and explain. 
A. Antegrade, B. Retrograde, C. Antegrade and retrograde, D. None
C: Antegrade and retrograde
Answer: C: Antegrade and retrograde 
Explanation: Fast anterograde (400 mm/day) transport occurs by kinesin molecular motor and retrograde transport (200 mm/day) occurs by dynein molecular motor.