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 not a cause of oropharyngeal carcinoma? \nSelect and explain. \nA. Occupational exposue to hydrochloric acid, B. Smoking, C. Human Papilloma Virus infection, D. Occupational exposure to isopropyl oil', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Occupational exposure to hydrochloric acid Etiology of oropharyngeal carcinoma Tobacco in any form - cigarette smoking or chewing Heavy alcohol abuse Beetle nut chewing Plummer vinson syndrome, cirrhosis Syphilis Trauma Dental irritation Poor oral hygiene Occupational exposure to isopropyl alcohol, sulphuric acid and nickel HPV infection", 'role': 'assistant'}]