This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Profuse expectoration of two months durations and clubbing may be seen 
Select and explain. 
A. Sarcoidosis, B. Polyaeritis nodosa, C. Pulmonary aery hypeension, D. Allergic bronchopulmonary aspergillosis
D: Allergic bronchopulmonary aspergillosis
Answer: D: Allergic bronchopulmonary aspergillosis 
Explanation: Allergic bronchopulmonary aspergillosis represents a hypersensitivity reaction to Aspergillus fumigatus.Episodes of bronchial obstruction with mucous plugs leading to coughing 'fits',breathlessness,pulmonary infiltrates.It can result in the development of bronchiectasis.Clubbing can be seen in this case. Reference:Harrison's Medicine-18th edition,page no:1658;Davidson's Medicine-22nd edition,page no:697.