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A 28-year-old bank employee undergoes investigation for infertility that revealed oligospermia. On further inquiry, it is found that he has suffered from repeated bouts of coughing since
childhood and episodes of recurrent pancreatitis. Clubbing of the fingers is evident. Which
test is most likely to reveal the cause of his chronic lung disease?
 
(A) Chest x-ray
(B) X-ray of the humerus
(C) Sweat chloride elevated to over 80 mEq/L
(D) Sweat chloride reduced to less than 50 mEq/L
(E) Aspergillus in the sputum
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(C) Sweat chloride elevated to over 80 mEq/L
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My answer is C
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