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: Surgery
[{'content': 'Inferior alveolar nerve block alone can be used in: \nSelect and explain. \nA. Pulpotomy of 3rd molar, B. Apicoectomy of 3rd molar, C. Extraction of 1st molar, D. Root resection of 1st molar', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]