This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: ENT
[{'content': 'Long-standing obstruction due to enlarged tonsils and adenoids can cause: \nSelect and explain. \nA. Lett ventricular hypertrophy, B. Bundle branch block, C. Cor pulmonale, D. Cardiac ischaemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Right ventricular hypertrophy and cor pulmonale are seen in long-standing tonsil and adenoid obstruction. It is reversible after adenotonsi llectomy.', 'role': 'assistant'}]