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: Unknown
Mapleson’s classification of anesthetic breathing system 
Select and explain. 
A. Describes four systems A, B, C, D, B. Classifies the Bain system as Mapleson, C. Describes the T-piece as M, D. Describes the T-piece system as requiring a fresh gas flow rate of 1.5 – 2 times the minute volume
B: Classifies the Bain system as Mapleson
Answer: B: Classifies the Bain system as Mapleson 
Explanation: The Mapleson D may be described as a co-axial modification of the basic T-piece system, developed to facilitate scavenging of waste anaesthetic gases.
Circuit