What deficiency is rickets associated with in children?

Rickets is primarily associated with a deficiency of vitamin D, which leads to impaired calcium absorption in the gut. When children do not get enough vitamin D, calcium and phosphate levels in the body can drop, ultimately resulting in weaker bones and stunted growth. This condition can manifest in skeletal deformities and pain, particularly in developing bones.

While calcium plays a crucial role in bone health, the scenario presented emphasizes that the deficiency directly correlates with the need for adequate vitamin D to facilitate calcium absorption. Therefore, a deficiency in calcium in the bones affects the body's ability to build and maintain strong bone tissues, further leading to a reduction in peak bone mass.

Other options like anemia due to iron deficiency or skin issues related to vitamin deficiencies are not linked to the primary characteristics of rickets, making the specific relationship between calcium deficiency and bone health the correct answer in this context.