This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Alpha I antitrypsin deficiency occurs in - 
Select and explain. 
A. Emphysema, B. Bronchiectasis, C. Empyema, D. Bronchogenic carcinoma
A: Emphysema
Answer: A: Emphysema 
Explanation: Ans. is `a' i.e., Emphysema