44) ANSWER

C) A tall, thin young man who smokes

Explanation

The etiology is not fully understood, but tall, young, thin-chested men who smoke are more prone to developing a spontaneous pneumothorax. Option 1 is more likely to be positive for tuberculosis (TB); option 2 might experience sleep apnea; and option 4 is more likely to experience pulmonary hypertension. Recall that spontaneous pneumothorax occurs in young, tall, thin males.