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
A patient presents with decreased vital capacity and total lung volume. What is the most probably diagnosis? 
Select and explain. 
A. Bronchiectasis, B. Sarcoidosis, C. Cystic fibrosis, D. Asthma
B: Sarcoidosis
Answer: B: Sarcoidosis 
Explanation: 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