A 17-year-old Aboriginal girl in a remote community has a history of definite acute rheumatic fever and mild rheumatic heart disease. According to current Australian guidelines, what is the recommended standard regimen for secondary prophylaxis?AOral phenoxymethylpenicillin twice daily for 5 yearsBBenzathine benzylpenicillin 1.2 million units IM every 3-4 weeksCSingle IM benzathine benzylpenicillin dose annuallyDNo prophylaxis if echocardiogram is normalECephalexin 250 mg twice daily lifelongCheck my answer