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': 'A false-negative response to the pulp tester may occur \nSelect and explain. \nA. primarily in anterior teeth., B. in a patient heavily premedicated  with analgesics, narcotics,  alcohol,  or tranquilizers., C. most often in  teenagers., D. in the  presence of periodontal  disease.', 'role': 'user'}, {'content': "Answer: B \nExplanation: Responses Obtained from Electric Pulp Testing\nFalse-Positive Responses\nPartial pulp necrosis\nPatient’s high anxiety\nIneffective tooth isolation\nContact with metal restorations\nFalse-Negative Responses\nCalcific obliterations in the root canals\nRecently traumatized teeth\nImmature apex\nDrugs that increase patient’s threshold for pain\nPoor contact of pulp tester to tooth\nCohen's Pathway of the Pulp ed: 11th Pg18", 'role': 'assistant'}]