This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Which of the following is precancerous lesion? 
Select and explain. 
A. Pachydermia of larynx, B. Laryngitis sicca, C. Keratosis of larynx, D. Scleroma larynx
C: Keratosis of larynx
Answer: C: Keratosis of larynx 
Explanation: Keratosis of larynx/leukoplakia:? It is epithelial hyperplasia of the upper surface of one or both vocal cords. Appears as a white plaque or way growth on cord without affecting its mobility Regarded as a precarcerous condition as Ca in situ develops frequently T/t=stripping of cords