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': 'Maximum coverage to distribute forces over a wide area \nSelect and explain. \nA. Snows shoe effect, B. Bezold-Brucke effect, C. Realeff effect, D. Spectral curve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]