This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous ENT, Subject name: ENT
[{'content': 'Which of the following is not a cause of oropharyngeal carcinoma \nSelect and explain. \nA. Occupational exposure to hydrochloric acid, B. Smoking, C. Human Papilloma Virus infection, D. Plummer-Vinson syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ETIOLOGY: Smoking: Incidence of oral cancer is six times more in smokers than in nonsmokers. Tobacco chewing: Carcinoma develops at the site of the quid. Alcohol: Cancer of upper aerodigestive tract occurs six times more in heavy drinkers as compared to nondrinkers. Dietary deficiencies: Riboflavin deficiency may be responsible for cancer in alcoholics. Paterson-Brown-Kelly syndrome also called Plummer-Vinson syndrome (iron deficiency anaemia) is responsible for cancer of the oral cavity and hypopharynx. Dental sepsis, jagged sharp teeth and ill-fitting dentures: All these cause chronic irritation and may lead to the development of cancer. Ref: Textbook of ENT, Dhingra; 6th edition; Pg no: 225', 'role': 'assistant'}]