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
The motility of cell is due to protein- 
Select and explain. 
A. Motilin, B. Tubulin, C. Laminin, D. Tactilin
B: Tubulin
Answer: B: Tubulin 
Explanation: Functions of Microtubules include determination of cell shape and various cell movements.