Final answer:
The correct answer is (b) Every 6 months for 2 years, then annually. Follow-up is necessary to monitor the adnexal mass.
Step-by-step explanation:
The correct answer is (b) Every 6 months for 2 years, then annually. After the discovery of an adnexal mass, follow-up examinations are necessary to monitor the mass and detect any changes. The frequency of follow-up may vary depending on the specific clinical situation, but generally, follow-up should occur every 6 months for 2 years and then annually. This allows for close monitoring of the mass and early detection of any potential issues or changes.