Final answer:
Thromboembolic events are a serious adverse effect of combined oral contraceptives, which also increase the risk of certain cancers and other health issues such as gall bladder disease and depression.
Step-by-step explanation:
Among the adverse effects of combined oral contraceptives, the nurse should include thromboembolic events as a possible side effect: D. Thromboembolic events. These events represent a serious health concern as they can lead to strokes or heart attacks due to blood clots. Furthermore, there is an increased risk for other complications such as breast cancer, and possibly gall bladder disease and depression, according to the relevant medical literature. It is important for clients to be aware of these potential risks when starting a new prescription for oral contraceptives.