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': 'Injection sclerotherapy for varicose veins is by usinga) Phenolb) Absolute alcoholc) 70% alcohold) Ethanolamine oleate \nSelect and explain. \nA. ad, B. c, C. ac, D. ab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sclerosing agents mentioned in the latest editions of Schwartz, CSDT and Bailey are:\n- hypertonic saline,\n- sodium tetradecyl sulfate, and\n- polidocanol\n2 other sclerosants are mentioned in KDT 6/e p597\n\nEthanolamine oleate\nPhenol in almond oil or Peanut oil', 'role': 'assistant'}]