A 77-year-old man with a 50 pack-year smoking history and history of pulmonary tuberculosis underwent bronchoscopy for evaluation of suspected lung cancer. During bronchoscopy, areas of black discoloration were seen on the mucosa of the left main bronchus. A biopsy sample showed ciliated respiratory epithelium with subepithelial accumulation of macrophages containing black pigment. Which of the following is the most likely cause of these findings?
一名77岁男性，有50包年吸烟史及肺结核病史，因疑似肺癌行支气管镜检查评估。支气管镜检查期间，可见左主支气管黏膜区域呈黑色变色。活检样本显示纤毛呼吸上皮正常，但上皮下积聚了大量含有黑色色素的巨噬细胞。以下哪项最可能是导致这些表现的原因？
A. Biomass smoke and environmental dust生物质烟雾与环境粉尘
B. Carcinogens from tobacco smoke烟草烟雾中的致癌物
C. Sarcoidosis结节病
D. Sequelae of treated pulmonary tuberculosis已治愈的肺结核后遗症
E. Tattoo from prior radiation therapy既往放射治疗的纹身样改变
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