You are answering a USMLE-style medical question. Question: A 60-year-old man presents to the office for shortness of breath. The shortness of breath started a year ago and is exacerbated by physical activity. He has been working in the glass manufacturing industry for 20 years. His vital signs include: heart rate 72/min, respiratory rate 30/min, and blood pressure 130/80 mm Hg. On physical exam, there are diminished respiratory sounds on both sides. On the chest radiograph, interstitial fibrosis with reticulonodular infiltrate is found on both sides, and there is also an eggshell calcification of multiple adenopathies. What is the most likely diagnosis? Options: A) Berylliosis B) Silicosis C) Asbestosis D) Talcosis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.