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 1 antitrypsin deficiency mechanism of transmission ? 
Select and explain. 
A. Autosomal recessive, B. Autosomal dominant, C. X linked recessive, D. X linked dominant
A: Autosomal recessive
Answer: A: Autosomal recessive 
Explanation: Ans. is 'a' i.e., Autosomal recessive