This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Swan Ganz Catheter is used to measure 
Select and explain. 
A. Mean aerial pressure, B. Cardiac output, C. Blood volume, D. Pulmonary capillary wedge pressure
D: Pulmonary capillary wedge pressure
Answer: D: Pulmonary capillary wedge pressure 
Explanation: The pulmonary aery catheter allows direct, simultaneous measurement of pressures in the right atrium, right ventricle, pulmonary aery, and the filling pressure ("wedge" pressure) of the left atrium.