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': 'Which one of the following reagents is not used as sclerosant in the treatment of bleeding varies- \nSelect and explain. \nA. Ethyl alcohol, B. Ethanolamine oleate, C. Phenol, D. Sodium morrhuate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]