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: Pathology
Reid's Index is? - 
Select and explain. 
A. Increased in Chronic Bronchitis, B. Decreased in Chronic Bronchitis, C. Increased in Bronchial Asthma, D. Decreased in Bronchial Asthma
A: Increased in Chronic Bronchitis
Answer: A: Increased in Chronic Bronchitis 
Explanation: There is histologic definition of chronic bronchitis by increased Reid index. Reid index is the ratio between thickness of the submucosal mucus glands (i.e. hyperophy and hyperplasia) in the cailage-containing large airways to that of the total bronchial wall. TEXTBOOK OF PATHOLOGY 6TH EDITION HARSH MOHAN PAGE NO:478