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 4 year child's radiograph shows small radialucency\nin the bifurcation area of primary Lower second molar.\nThere is bleeding on opening the root canal. The most\nlikely treatment to be is \nSelect and explain. \nA. Pulpectomy and stainless steel, B. Pulpotomy, C. Extraction of the tooth, D. Observe no treatment necessary", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]