This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disease of External Nose & Nasal Septum, Subject name: ENT
Most common cause of perforation of cartilaginous part of nasal septum - 
Select and explain. 
A. Syphilis, B. Tuberculosis, C. Wegener's granulomatosis, D. Septal abscess
D: Septal abscess
Answer: D: Septal abscess 
Explanation: Ans- D. D>B. Causes of septal perforation can be summarized under the following categories: trauma surgical repeated cautery digital trauma (nose picking) malignant disease malignant tumours non-Hodgkin lymphoma 5 malignant granuloma chronic inflammatory conditions granulomatosis with polyangiitis (Wegener granulomatosis) 5 syphilis tuberculosis sarcoidosis poisons industrial chronic (> 3 months) cocaine use 4 topical corticosteroids topical decongestants idiopathic