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': 'Function of a microtubule is/are: \nSelect and explain. \nA. Strength of cell skeleton, B. Base for cilia arising from the cell, C. Movements of cytoplasm within the cell, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]