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: Medicine
In a patient of heart disease antibiotic prophylaxis for dental extraction is: 
Select and explain. 
A. Amoxicillin., B. Imipenem., C. Gentamicin., D. Erythromycin.
A: Amoxicillin.
Answer: A: Amoxicillin. 
Explanation: None