This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Smallest functional unit of the lung is \nSelect and explain. \nA. Acinus, B. Alveolus, C. Lobules, D. Broncho pulmonary segments', 'role': 'user'}, {'content': 'Answer: C \nExplanation: [Cl (Lobule) (219 - I.B.Singh 5th)Lobule - small segment, is the functional unit of the lung including respiratory bronchioles, alveolar ducts and sacs and alveoli', 'role': 'assistant'}]