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
Special protein for motility of sperm is - 
Select and explain. 
A. Actin, B. Myosin, C. Kinesin, D. Dynein
D: Dynein
Answer: D: Dynein 
Explanation: Ans. is'd'i.e., Dynein"Sperm motility k based on the active sliding of microtubules by axonemal dyneins".