**Core Concept**
Dapsone is an antileprotic and antimalarial medication that can cause hemolysis, particularly in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency. The dose of Dapsone that does not cause hemolysis is crucial for patients with this condition.

**Why the Correct Answer is Right**
At a dose of 50mg, Dapsone is less likely to cause hemolysis due to its minimal effect on the red blood cell membrane. This lower dose is sufficient to exert its therapeutic effects without causing significant oxidative stress on red blood cells. In contrast, higher doses of Dapsone can lead to the accumulation of toxic metabolites, which in turn cause hemolysis. The mechanism of Dapsone-induced hemolysis involves the inhibition of G6PD, an enzyme responsible for maintaining the integrity of the red blood cell membrane.

**Why Each Wrong Option is Incorrect**
**Option B:** 200mg is a higher dose of Dapsone that can cause significant hemolysis, particularly in patients with G6PD deficiency. This dose is more likely to lead to oxidative stress and damage to red blood cells.
**Option C:** 300mg is an even higher dose of Dapsone that can cause severe hemolysis, leading to anemia and other complications. This dose is not suitable for patients with G6PD deficiency.
**Option D:** 500mg is a very high dose of Dapsone that can cause massive hemolysis, potentially leading to acute kidney injury and other life-threatening complications. This dose is not recommended for any patient.

**Clinical Pearl / High-Yield Fact**
Patients with G6PD deficiency should be started on a low dose of Dapsone (50mg) and gradually increased as needed to minimize the risk of hemolysis. Regular monitoring of hemoglobin levels and liver function tests is essential for patients on Dapsone therapy.

**✓ Correct Answer: A. 50mg**