This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of the Respiratory Tract, Subject name: Pediatrics
[{'content': 'Alpha-1- antitrypsin deficiency presents as? \nSelect and explain. \nA. Emphysema, B. Bronchitectasis, C. Empyema, D. Bronchogenic carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) EmphysemaRef: Robbins 8thEdn /684y 685, Harrison 18,hed chapter 309, Nelson Textbook of Pediatrics, 18th ed chapter 390', 'role': 'assistant'}]