This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Back region, Subject name: Anatomy
[{'content': 'Which cervical veebra has lateral mass: \nSelect and explain. \nA. Atlas, B. Axis, C. C5, D. C7', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lateral masses are the most bulky and solid pas of the atlas, in order to suppo the weight of the head. Each carry two aicular facets, a superior and an inferior. fig:- atlas C1', 'role': 'assistant'}]