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': 'Pulp capillary pressure \nSelect and explain. \nA. 14 cm of H2O, B. 25 cm of H2O, C. 80 cm of H2O, D. 120 cm of H2O', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]