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MediumRespiratoryOccupational asthmaca-mccqe1ca-ccfpca-rcpsc-im

A 28-year-old man presents with progressive shortness of breath, dry cough and chest tightness after starting work in a grain silo 3 months ago. Symptoms improve on weekends away from work. Chest X-ray is normal. What is the MOST likely diagnosis?

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