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
Which of the following statements about Anaesthetic Machine is true – 
Select and explain. 
A. Temperature of Desflurane Vaporizer Chamber is 39°C, B. Flow-meters (Rotameters) are Interchangeable, C. Oxygen sensors are placed on the expiratory limb of the anesthesia circuit, D. All of the above
A: Temperature of Desflurane Vaporizer Chamber is 39°C
Answer: A: Temperature of Desflurane Vaporizer Chamber is 39°C 
Explanation: Temperature of Desflurane Vaporizer Chamber is 39°C (Unique Features of Desflurane Vaporizers).
Flow-meters (Rotameters) are not interchangeable.
Oxygen sensors are placed on the Inspiratory limb of Anesthesia Circuit.