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: Anaesthesia
[{'content': 'Optimum oxygenation is maintained by adjusting following parameters\na — Tidal volume,b — PEEP,c — FiO2,d — respiratory rate \nSelect and explain. \nA. a, b, B. b, c, C. c, d, D. d, a', 'role': 'user'}, {'content': 'Answer: B \nExplanation: PEEP and FiO2 determine optimum oxygenation.', 'role': 'assistant'}]