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: Pathology
[{'content': 'The enzyme glucosyl transferase secreted by Streptococcus mutans synthesizes glucans from \nSelect and explain. \nA. Glucose, B. Fructose, C. Sucrose, D. Lactose', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]