21st February 2025

A 60-year-old man presents to his GP with a history of 6 months of reducing exercise tolerance and an irritating dry cough.

A 60-year-old man presents to his GP with a history of 6 months of reducing exercise tolerance and an irritating dry cough. When he is examined, his GP notes bibasal fine crackles as well as finger clubbing. He is sent for a chest X-ray which demonstrates widespread interstitial changes as well as bilateral areas of pleural thickening.
Exposure to which of the following workplace substances is most likely to have caused his symptoms?

Select the SINGLE most appropriate option from the list below. Select ONE option only.