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': "Clavulanic acid is given in combination with amoxicillin in order to \nSelect and explain. \nA. Reduce the risk of allergic reactions, B. Prolong amoxicillin's half-life, C. Reduce the severity of diarrhea, D. Extend amoxicillin's antibacterial spectrum", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]