**Core Concept**
Rheumatic fever prophylaxis involves the use of antibiotics to prevent recurrent episodes of rheumatic fever, which can lead to serious cardiac complications such as rheumatic heart disease. In patients with a history of penicillin allergy, alternative antibiotics must be used to prevent recurrent episodes.

**Why the Correct Answer is Right**
For patients with a history of penicillin allergy, erythromycin or azithromycin can be used as an alternative for rheumatic fever prophylaxis. These macrolide antibiotics have a similar efficacy profile to penicillin in preventing recurrent episodes of rheumatic fever. Erythromycin and azithromycin work by inhibiting protein synthesis in bacteria, thereby preventing the growth and multiplication of group A beta-hemolytic streptococci (GABHS), the causative agent of rheumatic fever.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because sulfonamides are not typically used for rheumatic fever prophylaxis due to their limited activity against GABHS and the potential for resistance.

**Option B:**
This option is incorrect because cephalosporins are not generally recommended for patients with a history of penicillin allergy due to cross-reactivity.

**Option C:**
This option is incorrect because tetracyclines are not typically used for rheumatic fever prophylaxis in children and adolescents due to the risk of tooth discoloration and other side effects.

**Clinical Pearl / High-Yield Fact**
In patients with a history of penicillin allergy, it is essential to perform an allergy evaluation to determine the likelihood of cross-reactivity with other beta-lactam antibiotics.

**Correct Answer: C. Azithromycin is a suitable alternative for rheumatic fever prophylaxis in patients with a history of penicillin allergy.**