The nurse is administering an estrogen blocker to a client diagnosed with advanced breast cancer. Which of the following side effects will the nurse caution the client regarding?

A. Estrogen blockers can increase the risk of thromboembolic events, including deep vein thrombosis and pulmonary embolism, which the nurse should caution the client about. B. Tendon rupture is more commonly associated with certain antibiotics and corticosteroids, not typically with estrogen blockers. C. Photosensitivity is not a common side effect associated with estrogen blockers; it is more related to specific antibiotics or other medications. D. While some malignancies can be linked to immunosuppressive therapies, the direct risk of lymphomas is not typically associated with estrogen blockers.