A nurse is reviewing the medical record of a client who is requesting combination oral contraceptives. Which of the following conditions in the client's history is a contraindication to the use of combination oral contraceptives?

A. Hyperthyroidism. This condition is not a contraindication to the use of combination oral contraceptives. Women with hyperthyroidism can generally use hormonal contraceptives safely under medical supervision. B. Hypocalcemia. Low calcium levels are not linked to increased risk with combination oral contraceptives and do not contraindicate their use. C. Thrombophlebitis. This condition involves inflammation and clot formation in the veins, and is a major contraindication to combination oral contraceptives. These medications increase the risk of blood clots, making them unsafe for clients with current or prior thromboembolic disorders. D. Diverticulosis. This gastrointestinal condition is not affected by hormone levels and is not a contraindication to combination oral contraceptive use.