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: Anatomy
[{'content': 'Infrahyoid ribbon muscles are contained in - \nSelect and explain. \nA. Muscular triangle, B. Submental triangle, C. Anterior digastric triangle, D. Carotid triangle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Infrahyoid ribbon muscles are the chief contents of muscular triangle.', 'role': 'assistant'}]