You are answering a USMLE-style medical question. Question: A 23-year-old woman is referred to a genetic counselor. She is feeling well but is concerned because her brother was recently diagnosed with hereditary hemochromatosis. All first-degree relatives were encouraged to undergo genetic screening for any mutations associated with the disease. Today, she denies fever, chills, joint pain, or skin hyperpigmentation. Her temperature is 37.0°C (98.6°F), pulse is 85/min, respirations are 16/min, and blood pressure is 123/78 mm Hg. Her physical examination is normal. Her serum iron, hemoglobin, ferritin, and AST and ALT concentrations are normal. Gene screening will involve a blood specimen. Which of the following genes would suggest hereditary hemochromatosis? Options: A) BCR-ABL gene B) BRCA gene C) FA gene D) HFE gene Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.