The Mother of 6-Year-Old Male and Female Fraternal Twins Has

Multiple Choice

The mother of 6-year-old male and female fraternal twins has brought her son to see a pediatrician because he is nearly 4 inches shorter than his sister. Which of the following phenomena would the physician most likely suspect as contributing factor to the boy's short stature?

A) Genetic short stature
B) Lack of IGF receptors in epiphyseal long bones
C) A shortage of hypothalamic GHRH production
D) Excess insulin production resulting in chronically low blood glucose levels