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': 'Most common cause of singers nodule is \nSelect and explain. \nA. Infection, B. Vocal abuse, C. Allergy, D. Carcinoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Vocal nodules( Singer's nodules) They appear symmetrically on the free edge of vocal cord, at the junction of anterior one - third, with the posterior two - thirds, as this is the area of maximum vibration of the cord and this subject to maximum trauma. They are the result of vocal trauma when a person speaks in unnatural low tones for prolonged periods or at high intensities. Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 343", 'role': 'assistant'}]