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
[{'content': 'Which of the following is precancerous lesion - \nSelect and explain. \nA. Pachydermia of larynx, B. Laryngitis sicca, C. Keratosis of larynx, D. Scleroma larynx', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lichen planus has no malignant potential.\n\nPapilloma– “The malignant transformation from benign non keratining squamous papilloma to squamous cell carcinoma can occur in children, but is rarely seen”\xa0\nLeukoplakia is a white patch, in which there is epithelial hyperplasia along with atypical cells. It is a premalignant condition. Another name for leukoplakia is hyperkeratosis dyskeratosis\nSmoking is a predisposing factor, not a premalignant condition. y In some cases of chronic laryngitis, the laryngeal mucosa becomes dysplastic particularly over true vocal folds and is a premalignant condition.\nChronic inflammatory conditions of larynx like chronic laryngitis may develop into malignancy.\n\nKeratosis of larynx/leukoplakia:- \nIt is epithelial hyperplasia of the upper surface of one or both vocal cords.\n\nAppears as a white plaque or warty growth on cord without affecting its mobility\nRegarded as a precarcerous condition as Ca in situ develops frequently\nT/t = stripping of cords', 'role': 'assistant'}]