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': 'All the following criteria contribute to a successful direct\npulp capping procedure except: \nSelect and explain. \nA. Haemorrhage from the exposure site is easily controlled, B. The exposure site is small, less than 0.5mm in diameter, C. Exposure site is the consequence\tof infected\tdentin extending into the pulp, D. Exposure occurred in a clean uncontaminated field', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]