This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstructive Lung Disease, Subject name: Pathology
Most common type of emphysema clinically is: 
Select and explain. 
A. Panacinar, B. Centriacinar, C. Paraseptal, D. Segmental
B: Centriacinar
Answer: B: Centriacinar 
Explanation: Centriacinar emphysema It is most common type of emphysema seen clinically. It involves central pa of acinus with sparing of alveoli. Seen in smokers . Upper Lobes of lung are affected Due to the destruction of alveolar walls, a lack of elastic recoil causes air to become trapped in alveoli, and, thus, airflow obstruction occurs on expiration. -Histology Image of Centriacinar emphysema showing fragmented and free floating alveolar septae