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: Pathology
[{'content': 'Tooth discolouration due to high biLirubin secretion is seen in the \nSelect and explain. \nA. Pink tooth of mummery, B. Ochronosis, C. Chlorodontia, D. Leong teeth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]