An Infant Has Been Diagnosed as Having Congenital Hypothyroidism

An infant has been diagnosed as having congenital hypothyroidism. L-thyroxine is ordered for the infant. The infant is being bottle-fed. Why will the nurse who is working with this child and family instruct the caregivers to avoid formulas that are soy-based and provide the family with a list of soy-based formulas?

A) L-thyroxine's absorption is affected by formulas that are soy based.
B) Children who are on L-thyroxine and soy-based formulas often have allergic reactions.
C) The L-thyroxine interferes with the absorption of calcium in the soy formula.
D) Infants on soy formula and L-thyroxine will tend to vomit the formula.