MRCP2-4374

A 28-year-old male patient complains of haemoptysis. He has been experiencing a productive cough since childhood and has a history of recurrent sinusitis. Additionally, he has been diagnosed with infertility. Upon investigation, his immunoglobulins were found to be normal, as was his sweat sodium level. Skin prick tests for grass pollen, house dust mite, and aspergillus were negative. What is the probable diagnosis?