This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Rhinitiss sicca involves 
Select and explain. 
A. Anterior nares, B. Septum, C. Posterior wall, D. Lateral wall
B: Septum
Answer: B: Septum 
Explanation: Rhinitis sicca is a crust-forming disease seen in patients who work in hot, dry and dusty surroundings, e.g. bakers, iron- and goldsmiths.Condition is confined to the anterior third of nose paicularly of the nasal septum. Here, the ciliated columnar epithelium undergoes squamous metaplasia with atrophy of seromucinous glands. Crusts form on the anterior pa of septum and their removal causes ulceration and epistaxis, and may lead to septal perforation.Dhingra 6e pg: 155