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': 'False about the precipitate formed as a result of reaction of chlorhexidine and NaOCl \nSelect and explain. \nA. Interferes with seal of obturation, B. Causes cyanosis, C. To prevent rinse canal with absolute alchohol, D. NaOCl is always used as final rinse', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]