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 produces the least damage to blood elements – 
Select and explain. 
A. Disc oxygenator, B. Membrane oxygenator, C. Bubble oxygenator, D. Screen oxygenator
B: Membrane oxygenator
Answer: B: Membrane oxygenator 
Explanation: Hematological advantages of membrane oxygenater over bubble oxyenators :- Less trauma to RBCs, platelets & WBCs and less protein denaturation.