**Core Concept**
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a genetic disorder that affects the enzyme G6PD, which protects red blood cells from oxidative damage. Certain medications can trigger hemolysis in individuals with G6PD deficiency by generating reactive oxygen species (ROS) that overwhelm the cell's antioxidant defenses.

**Why the Correct Answer is Right**
Chloroquine, an antimalarial drug, is known to cause hemolysis in G6PD patients. This is because chloroquine can generate ROS through a mechanism involving the reduction of molecular oxygen to superoxide anion (O2-) and hydrogen peroxide (H2O2). These ROS can then react with the cell's lipids, proteins, and DNA, leading to cell membrane damage and ultimately, hemolysis.

**Option A:** Cephalosporins are a class of antibiotics that are generally safe in G6PD patients. They do not have a known mechanism of generating ROS that could trigger hemolysis.

**Option B:** Ampicillin, a beta-lactam antibiotic, is also not typically associated with hemolysis in G6PD patients. Its mechanism of action does not involve the generation of ROS.

**Option D:** Erythromycin, a macrolide antibiotic, is not known to cause hemolysis in G6PD patients. Its mechanism of action does not involve the generation of ROS.

**Clinical Pearl / High-Yield Fact**
When prescribing medications to patients with G6PD deficiency, it's essential to avoid drugs that can trigger hemolysis. A mnemonic to remember common culprits is "CHOCOLATE": chloroquine, halothane, oxyphenbutazone, cotrimoxazole, nitrofurantoin, aspirin, and ephedrine. Always check the patient's medication list and medical history before prescribing new medications.

**✓ Correct Answer: C. Chloroquine**