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': 'The amount of force needed to compact direct filling gold properly is influenced mostly by the: \nSelect and explain. \nA. Angle of compaction, B. Surface area of the condenser, C. Bulk of the surrounding tooth, D. Temperature at which gold is annealed', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]