This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Tubercular laryngitis affects primarily 
Select and explain. 
A. Anterior commissure, B. Posterior commissure of larynx, C. Anywhere within the larynx, D. Superior surface of larynx
B: Posterior commissure of larynx
Answer: B: Posterior commissure of larynx 
Explanation: The disease affects posterior pa of larynx more than anterior. Pas affected are (i) interarytenoid fold (ii) ventricular bands (iii) vocal cords and (iv) epiglottis, in that order. Tubercle bacilli, carried by sputum from the bronchi, settle and penetrate the intact laryngeal mucosa paicularly in the interarytenoid region (bronchogenic spread). This leads to the formation of submucosal tubercles which may later caseate and ulcerate. Ref: PL Dhingra 6th edition of Ear, Nose and Throat; Pg no 293