This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2019, Subject name: Pathology
Which of the following is true about alpha 1 antitrypsin? 
Select and explain. 
A. Inhibits elastase, B. Inhibits trypsinogen activation in pancreas, C. Inhibits trypsin activating protease, D. Inhibits chymotrypsin
A: Inhibits elastase
Answer: A: Inhibits elastase 
Explanation: Alpha 1 antitrypsin : anti elastase protein coded by gene PiMM gene. Any mutation in this gene lead to abnormal formation of alpha 1 antitrypsin protein which leads to Storage of this abnormal enzyme inside hepatocyte instead of it's secretion resulting in manifestation of micronodular cirrhosis of liver and Pan acinar emphysema in basal pa of lung.