Answer:

Step-by-step explanation:
First, let's "dissect" each word. We know that aden- means gland.
Adenopathy
- Aden- : gland
- -pathy: disease
- Definition: disease of the glands
Adenectomy
- Aden: -gland
- -ectomy: removal
- Definition: surgical removal of a gland
Adenoma
- Aden: gland
- -oma: tumor
- Definition: gland tumor
So, based on the definitions we created above, the correct answer must be adenoma, because -oma means tumor.