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: Anatomy
[{'content': 'True about alpha-1 antitrypsin deficiency,is : \nSelect and explain. \nA. Autosomal dominant, B. Pulmonary emphysema, C. Disease resistant hepatic cells, D. Hepatic cells are orcein stain positive', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Alpha-1 antitrypsin deficiency is an autosomal recessive disease marked by abnormally low serum levels of alpha1 AT enzyme resulting in panacinar emphysema.(ref Robbins 9/e p675-676)', 'role': 'assistant'}]