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: Dental
[{'content': 'Film size for anterior occlusal radiograph: \nSelect and explain. \nA. Size 0, B. Size 1, C. Size 2, D. Size 4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Size 2 for anterior occlusal radiograph.\nSize 4 is occlusal film that is for entire mandible or maxilla.', 'role': 'assistant'}]