A nurse is conducting a class to a group of parents on sickle cell anemia. Which statement by a parent indicates teaching has been effective?

Rationale: A. "This is a hereditary disease that is transmitted by one affected gene.": Sickle cell anemia is an autosomal recessive disorder requiring two copies of the mutated gene; having only one copy results in the trait, not the disease itself. B. "Fluid restriction is necessary to control sickle cell anemia.": Adequate hydration is crucial in managing sickle cell anemia to prevent sickling crises, so fluid restriction is contraindicated. C. "The sickle shape of red blood cells decreases oxygen to tissues.": The abnormal sickle shape reduces the cells’ ability to carry oxygen and causes vaso-occlusion, leading to decreased oxygen delivery to tissues, which is a key pathophysiological aspect of the disease. D. "Sickle cell anemia is common in people of Asian descent.": The disease primarily affects individuals of African, Mediterranean, Middle Eastern, and Indian descent, not predominantly those of Asian descent.