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': 'In controlled ventilation – a) Patient is activeb) Patient is passivec) Ventilator is actived) IPPVe) Ventilater is passive \nSelect and explain. \nA. abc, B. bcd, C. ac, D. bd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Controlled mechanical ventilation is total support ventilator, i.e. total support is provided by ventilator :- ventilator is active and does all the work; patient is passive. CMV is also known as intermittent positive pressure ventilation (IPPV).', 'role': 'assistant'}]