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
In controlled ventilation – a) Patient is activeb) Patient is passivec) Ventilator is actived) IPPVe) Ventilater is passive 
Select and explain. 
A. abc, B. bcd, C. ac, D. bd
B: bcd
Answer: B: bcd 
Explanation: 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).