This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Which of the following is seen in both prokaryotes and eukaryotes: \nSelect and explain. \nA. Mitochondria, B. Ribosome, C. Endoplasmic reticulum, D. Lysosomes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b (Ribosomes) Ref: Ananthanarayan, 7th ed, p. 7Ribosomes are present in both prokaryotic and eukaryotic cells. ProkaryoticEukaryoticSizeSmallLarge 1000 to 10,000 timesCell wallRigidMembrane of lipid bilayerNucleusNot definedWell definedOrganellesNilSeveral-mitochondria lysosome etc.Muramic acidPresentAbsentSterolsAbsentPresentChromo somesOne (circular)More than one( linear)', 'role': 'assistant'}]