A nurse is discussing the diagnosis of Duchenne muscular dystrophy (DMD) with the parents of an 8-year-old. She correctly explains:

Rationale: A. Duchenne muscular dystrophy is a progressive, X-linked recessive disorder characterized by ongoing muscle fiber degeneration and weakness, typically worsening over time and leading to loss of ambulation and early death. B. DMD is an X-linked recessive disorder, not dominant. Mothers are typically carriers, and males are affected. Parents are usually asymptomatic. C. DMD has no cure, and spontaneous recovery of muscle function does not occur. D. DMD is genetic, not caused by medication toxicity.