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
Cell motility is due to protein 
Select and explain. 
A. Motilin, B. Centromere, C. Microtubule, D. Microfilament
C: Microtubule
Answer: C: Microtubule 
Explanation: Microtubules contains globular proteins - α and β tubulin which helps in cell motility and intracellular transport.