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: Medicine
Normal Pulmonary Capillary Wedge Pressure (PCWP) is: 
Select and explain. 
A. 6-12 mm Hg, B. 10-14 mm Hg, C. 12-18 mm Hg, D. 18-25 mm Hg
A: 6-12 mm Hg
Answer: A: 6-12 mm Hg 
Explanation: Answer is A (6-12 mm Hg): Capillary Wedge Pressure is between 6 to 12 mmHg. Pulmonary capillary wedge pressure (PCWP) (Normal = 6 to 12 mm Hg) PCWP is recorded when the PA catheter balloon is inflated and wedged in a branch of the pulmonary aery. PCWP reflects left atrial pressure When there is no obstruction between the left atrium and ventricle PCWP =left atrial pressure = left ventricular end-diastolic pressure)