Biology

Rickets is a condition caused by a deficiency in vitamin D, calcium, or phosphate, leading to weakened bones in children.
The symptoms described—bowed legs, delayed growth, and muscle weakness—are hallmark signs of rickets.
Elevated parathyroid hormone (PTH) levels indicate that the body is attempting to compensate for low calcium levels by increasing bone resorption, which further weakens the bones.

Option A (Paget's disease): Paget's disease affects older adults and involves abnormal bone remodeling, ...