<prompt> Pneumothorax is not a usual occurance with which of the following conditions?AsthmaMarfans syndromeBronchopulmonary aspergillosisPositive pressure ventilation  <response>: The most common of secondary spontaneous pneumothorax is chronic obstructive pulmonary disease, which accounts for approximately 70 of cases. Other causes include diseases of the airways chronic obstructive pulmonary disease, acute severe asthma, cystic fibrosis, infections of the lung Pneumocystis pneumonia PCP, tuberculosis, necrotizing pneumonia, interstitial lung disease Sarcoidosis, idiopathic pulmonary fibrosis, histiocytosis X, connective tissue diseases Rheumatoid ahritis, ankylosing spondylitis, polymyositis and dermatomyositis, systemic sclerosis, Marfans syndrome and Ehlers-Danlos syndrome and Ca bronchus. 