Final answer:
It is important to keep the end of the chest tube sterile.
Step-by-step explanation:
The correct answer is Sterile. When inserting the end of a new drainage system into a chest tube, it is important to keep the end of the chest tube sterile. This helps prevent the introduction of bacteria and reduce the risk of infection. Sterile technique involves using sterile gloves, disinfecting the entry site, and using sterile equipment.