A nurse is caring for a client who recently traveled to a malaria-stricken country. The client is diagnosed with malaria and is prescribed chloroquine (Aralen). Which of the following adverse effects should the nurse educate the client regarding this medication?

A. Retinal toxicity: Chloroquine is associated with retinal toxicity, which can lead to vision changes or damage. Regular eye exams are necessary to monitor for early signs of toxicity. B. Tumors: Chloroquine is not associated with the development of tumors. C. Pancytopenia: This refers to a reduction in all blood cells and is not a known adverse effect of chloroquine. D. Cancer: Chloroquine is not linked to an increased risk of cancer.