Pes planus is a term for:

Rationale: A. Inversion of the foot refers to turning the sole inward, not pes planus. B. Pes planus is the medical term for flat feet, a condition where the arches of the feet are flattened, allowing the entire sole to touch the ground. It can be flexible or rigid and may be asymptomatic in children. C. Metatarsus refers to the long bones of the foot, not the arch configuration. D. Pigeon toe (in-toeing) describes a rotational deformity of the feet, not the flattening of the arches.