Restrictive lung diseases Quiz: Ace Your Exams

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A 56-year-old man presents to his primary care PA with a non-productive cough and associated shortness of breath with exertion. He reports his symptoms started after he began working as a manager in a textile factory. He reports he is otherwise healthy and does not take any medications daily. His temperature is 37°C (98.6°F), pulse is 61/min, respirations are 18/min, blood pressure is 131/74 mmHg, and oxygen saturation is 96% on room air. Physical examination is otherwise unremarkable. As part of his work-up, he undergoes a transbronchial biopsy, which demonstrates multiple ferruginous bodies, as depicted below:  


Reproduced from: Wikipedia   
This patient likely has occupational exposure to which of the following inorganic compounds?  

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