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
Clavulanic acid is given in combination with amoxicillin in order to 
Select and explain. 
A. Reduce the risk of allergic reactions, B. Prolong amoxicillin's half-life, C. Reduce the severity of diarrhea, D. Extend amoxicillin's antibacterial spectrum
D: Extend amoxicillin's antibacterial spectrum
Answer: D: Extend amoxicillin's antibacterial spectrum 
Explanation: None