A 45-year-old male with a 20-year history of smoking presents with a chronic cough, hemoptysis, and weight loss. Chest X-ray shows a mass in the upper lobe. Biopsy reveals small cell carcinoma. Which of the following is the most significant environmental risk factor for his condition? A. A) Occupational exposure to asbestosO B. B) Air pollutionO C. C) Cigarette smoking D. D) Radon exposure
[Solved]: A 45-year-old male with a 20-year history of…
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