This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'A patient presents with decreased vital capacity and total lung volume. What is the most probably diagnosis? \nSelect and explain. \nA. Bronchiectasis, B. Sarcoidosis, C. Cystic fibrosis, D. Asthma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Decreased vital capacity and decreased total lung volume suggests a restrictive lung disease picture.amogst the options provided sarcoidosis is the only restrictive lung disease Ref Harrison 19th edition pg 2207', 'role': 'assistant'}]