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
[{'content': 'Special protein for motility of sperm is - \nSelect and explain. \nA. Actin, B. Myosin, C. Kinesin, D. Dynein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is\'d\'i.e., Dynein"Sperm motility k based on the active sliding of microtubules by axonemal dyneins".', 'role': 'assistant'}]