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 of the following are the features of formocresol used as pulpotomy agent except: \nSelect and explain. \nA. It bind reversibly., B. Small droplet has deeper penetration., C. It does not cross the apex., D. It is carcinogenic.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: formocresol crosses the apex.', 'role': 'assistant'}]