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': 'Most important factor for the success of IPC: \nSelect and explain. \nA. Adequate seal, B. Type of material., C. Patient cooperation., D. All of the above.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]