This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
Circuit of choice for controlled ventilation 
Select and explain. 
A. Magill circuit, B. Type C, C. Type D, D. Type E
C: Type D
Answer: C: Type D 
Explanation: Bains co-axial system is used in controlled ventilation.Fresh gas flow required to prevent rebreathing is 1.6MV.