**Core Concept**
Primaquine-induced hemolysis is a classic example of glucose-6-phosphate dehydrogenase (G6PD) deficiency, a genetic disorder affecting the enzyme responsible for maintaining the integrity of red blood cell membranes. In individuals with G6PD deficiency, oxidative stress caused by primaquine leads to red blood cell destruction.

**Why the Correct Answer is Right**
The patient's symptoms, including intravascular hemolysis, hemoglobinemia, and hemoglobinuria, are indicative of a hemolytic crisis. Primaquine, an antimalarial drug, is known to induce hemolysis in individuals with G6PD deficiency due to its oxidative properties. The enzyme deficiency impairs the cell's ability to maintain glutathione levels, leading to the destruction of red blood cells. This mechanism is consistent with the patient's presentation two days after receiving primaquine.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because primaquine-induced hemolysis is not typically associated with other genetic disorders, such as glucose-6-phosphate isomerase deficiency.

**Option B:** This option is incorrect because primaquine-induced hemolysis is not typically seen in patients with other types of hemoglobinopathies, such as sickle cell disease.

**Option C:** This option is incorrect because primaquine-induced hemolysis is not typically associated with autoimmune disorders, such as autoimmune hemolytic anemia.

**Clinical Pearl / High-Yield Fact**
Primaquine-induced hemolysis is a classic exam question, and it's essential to remember that individuals with G6PD deficiency are at risk of developing hemolysis when exposed to oxidative stressors like primaquine. This is a high-yield fact for exams, as it highlights the importance of considering genetic disorders when interpreting patient presentations.

**Correct Answer:** C. G6PD deficiency