Taking a sample of pleural fluid is called thoracentesis.
The correct option is 1.
How to complete the statement?
Thoracentesis is a medical procedure in which a needle or catheter is inserted through the chest wall into the pleural space to remove excess fluid or air.
The pleural space is the thin fluid-filled space between the two layers of tissue (pleura) that surround the lungs. Normally, there is a small amount of fluid in the pleural space that helps the lungs move smoothly within the chest cavity.