Final answer:
The most likely tube to be used post-op for a thoracic aneurysm is a chest tube, as it helps drain the chest cavity and ensures proper lung function after the surgery.
Step-by-step explanation:
The post-op thoracic aneurysm is most likely to have a chest tube. After a thoracic surgery, such as an aneurysm repair, a chest tube is often used to drain fluid, blood, or air and to allow full expansion of the lungs. The chest tube assists in re-establishing normal pressure in the chest cavity, which is crucial for proper lung function post-operation.
While other tubes like the nasogastric tube or tracheostomy tube may also be used in different post-operative contexts, the direct relevance to thoracic surgery and the objective of re-establishing chest pressure makes the chest tube the most likely option.