Q. A 52-year-old woman, who is a known case of rheumatoid arthritis, comes to the physician’s office for blurred vision and difficulty in reading in both eyes for the past 2 months. She also complains of seeing halos and glares in bright light. She doesn’t have any congestion or excessive watering in her eyes. Her medical history shows that she was diagnosed with rheumatoid arthritis 7 years ago and is getting treated with multiple drugs. She says that due to increased stiffness in her hand joints, a new drug has been added to her regular treatment regimen 2 years ago. Her temperature is 99.8°F (37.6°C), pulse is 90/min, blood pressure is 130/80 mmHg, and respirations are 14/min. Physical examination shows findings of rheumatoid arthritis. Ophthalmic examination shows a central patchy area of depigmentation of the macula surrounded by a concentric ring of pigmentation. Which of the following drugs in her treatment regimen may be most likely responsible for her symptoms?