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
[{'content': 'A patient with hoarseness of voice was found to be having pachydermia laryngis. All of the following are true except: \nSelect and explain. \nA. It is a hyperkeratotic lesion present within the anterior two-third of the vocal cords, B. It is not premalignant lesion, C. Diagnosis is made by biopsy, D. On microscopy it shows acanthosis and hyperkeratosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pachydermia laryngis is a hyperkeratotic lesion involving posterior part of larynx. It is not premalignant. Biopsy is essential to exclude tuberculosis and cancer.', 'role': 'assistant'}]