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': 'Pulpotomy is not indicated in- \nSelect and explain. \nA. Small pulp exposure since 1 hour, B. Pulp exposure in permanent tooth with open apex, C. Pulp exposure in permanent tooth with closed apex treated immediately after injury, D. Insufficient crown structure remaining', 'role': 'user'}, {'content': 'Answer: A \nExplanation: If the patient is seen within an hour or two after the injury, if the vital exposure is small, and if\xa0 suﬃcient crown remains to retain a temporary restoration to support the capping material and\xa0 prevent the ingress of oral ﬂuids, the treatment of choice is direct pulp capping.\n\xa0If the pulp exposure in\xa0 a traumatized, immature permanent (open apex) tooth is large, if even a small pulp exposure exists\xa0 and the patient did not seek treatment until several hours or days after the injury, or if there is\xa0 insuﬃcient crown remaining to hold a temporary restoration, the immediate treatment of choice is a\xa0 shallow pulpotomy or a conventional pulpotomy.\xa0\nA shallow or partial pulpotomy is preferable if\xa0 coronal pulp inﬂammation is not widespread and if a deeper access opening is not needed to help\xa0 retain the coronal restoration.\n\xa0Pulpotomy is also indicated for immature permanent teeth if necrotic\xa0 pulp tissue is evident at the exposure site with inﬂammation of the underlying coronal tissue, but a\xa0 conventional or cervical pulpotomy would be required.\xa0\nYet another indication is trauma to a more\xa0 mature permanent (closed apex) tooth that has caused both a pulp exposure and a root fracture. In\xa0 addition, a shallow pulpotomy may be the treatment of choice for a complicated fracture of a tooth\xa0 with a closed apex when deﬁnitive treatment can be provided soon after the injury.', 'role': 'assistant'}]