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: Pharmacology
[{'content': 'Eutectic mixture of 2.5% lidocaine and 2.5% prilocaine is primarily used in: \nSelect and explain. \nA. Gasserian ganglion block, B. Gow gates inferior alveolar nerve block, C. Topical skin application, D. Spinal anesthesia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]