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': 'Which is not an intracanal medicament : \nSelect and explain. \nA. Calcium hydroxide., B. Chlorhexidine digluconate., C. MTAD., D. None.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The two antimicrobial intracanal medicaments recommended in contemporary endodontic practice are as follows:\n\nCalcium hydroxide\nChlorhexidine digluconate', 'role': 'assistant'}]