A lack of iodine in the diet contributes to several deficiency diseases, such as congenital hypothyroidism and:

A. retarded sexual maturation
B. diabetes
C. goiter
D. gigantism

c
Rationale: A lack of iodine in the diet contributes to several deficiency diseases such as goiter (a swelling of the thyroid gland) and congenital hypothyroidism (a condition of extreme hypothyroidism) as well as myxedema (marked by coma, hypothermia, and respiratory depression).