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': 'Vital staining was introduced by: \nSelect and explain. \nA. Enlow, B. Wolff, C. John Hunter, D. Petrovic', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vital staining is an experimental method of measuring\xa0growth. It was introduced by John Hunter in the eighteenth century. The method consists of injecting dyes that stain the mineralizing tissues.\xa0These dyes get deposited in the bones and teeth and the animals are sacrificed and tissues studied histologically. Hunter studied the growth of mandible in the pig.', 'role': 'assistant'}]