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
True about alpha-1 antitrypsin deficiency,is : 
Select and explain. 
A. Autosomal dominant, B. Pulmonary emphysema, C. Disease resistant hepatic cells, D. Hepatic cells are orcein stain positive
B: Pulmonary emphysema
Answer: B: Pulmonary emphysema 
Explanation: 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)