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
[{'content': 'Most common type of emphysema clinically is: \nSelect and explain. \nA. Panacinar, B. Centriacinar, C. Paraseptal, D. Segmental', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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', 'role': 'assistant'}]