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': 'In direct pulp capping cases most important for the formation of dentinal bridges by dentinogenesis is: \nSelect and explain. \nA. Calcium hydroxide and pulp interaction., B. Extracellular Matrix., C. De occlusion of involved teeth., D. Lack of pulpal inflammation.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Though there is no direct reference in book about dentinal\xa0bridge formation but bridge formation definitely occurs\xa0only after interaction between calcium hydroxide & cells of\xa0pulp tissue.', 'role': 'assistant'}]