This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Opening of jaw is done by \nSelect and explain. \nA. Temporalis, B. Lateral pterygoid, C. Med pterygoid, D. Masseter', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lateral pterygoid is sho, conical, and has upper and lower heads. The lateral pterygoid: - depress mandible to open mouth, with suprahyoid muscles. - protrudes mandible - right lateral pterygoid turns the chin to left side.', 'role': 'assistant'}]