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': 'The cotton applied to the pulpal stumps in the formocresol pulpotomy technique should be: \nSelect and explain. \nA. Left for 10 minutes in the cavity, B. Left for 5 minutes in the cavity, C. Left for an hour in the cavity, D. Time depends upon the severity of the infection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Steps in formocresol pulpotomy\n\nThe pulp chamber is\xa0dried\xa0with\xa0sterile\xa0cotton\xa0pellets. Next,\xa0a\xa0pellet\xa0of\xa0cotton\xa0moistened\xa0with\xa0a\xa01:5\xa0concentration\xa0of\xa0Buckley’s\xa0formocresol\xa0and\xa0blotted\xa0on sterile gauze to remove the excess is placed in contact with the pulp stumps and allowed to remain for 5 minutes.\xa0\nBecause formocresol is caustic, care must be taken to avoid contact with the gingival tissues. The pellets are then removed, and the pulp chamber is dried with new pellets.\nA thick paste of hard-setting zinc oxide–eugenol is prepared and placed over the pulp stumps.\xa0\nThe tooth is then restored with a stainless steel crown.\n\nMcDONALD AND AVERY’S DENTISTRY\xa0 CHILD\xa0 \xa0ADOLESCENT 10thEd P:229', 'role': 'assistant'}]