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': 'Structure without any membrane is \nSelect and explain. \nA. Mitochondria, B. Nucleus, C. Nucleolus, D. Endoplasmic reticulum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nucleolus is present in nucleus. Theirfunction is to produce ribosome. They are not enclosed by a membrane and contain proteins, DNA, RNA. (REF TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 11)', 'role': 'assistant'}]