This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Skeletal framework of a cell is maintained by \nSelect and explain. \nA. Nucleus, B. Microtubules, C. Ribosomes, D. Mitochondtia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is a pa of cytoskeleton Microtubules are major components of the cytoskeleton. They are found in all eukaryotic cells, and they are involved in mitosis, cell motility, intracellular transpo, and maintenance of cell shape. Microtubules are composed of alpha- and beta-tubulin subunits assembled into linear protofilaments. Ref guyton and hall textbook of medical physiology 12/e p22', 'role': 'assistant'}]