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Question category: Respiratory

A 28 year old man and his partner present as they are having trouble conceiving. Further investigations reveal immobile sperm. The gentleman also gives a history of having chronic rhinorrhoea. He has also has a chronic cough and has had several episodes of sinusitis and pneumonia. A Chest X-ray reveals dextrocardia. A sweat test is normal. Which of the following is the most likely diagnosis?

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