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': 'The cause for contact ulcer in vocal cords is: \nSelect and explain. \nA. Voice abuse, B. Smoking, C. TB, D. Malignancy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Aetiology of contact ulcers is mutli factorial but the most impoant cause is: Voice abuse (faulty production of voice rather than excess use).', 'role': 'assistant'}]