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': 'The motility of cell is due to protein- \nSelect and explain. \nA. Motilin, B. Tubulin, C. Laminin, D. Tactilin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Functions of Microtubules include determination of cell shape and various cell movements.', 'role': 'assistant'}]