You are answering a USMLE-style medical question. Question: A 35-year-old woman presents with an unsteady and broad-based gait, dysmetria, and intention tremor in the distal upper extremities. Her past medical history is relevant for depression, personality changes, and declining work performance, for which she has been put on leave from her current job as an elementary school teacher. On physical examination, patient has dysarthria, dystonia, and an ataxic gait. Ophthalmologic examination reveals multi-colored irises with concentric rings around the periphery (findings shown in the photo). Sensation and motor functions are preserved. Which of the following would you expect to be abnormally accumulated in this patient’s tissues? Options: A) Iron B) Copper C) Lead D) Mercury Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.