DrPierce Examines a 10-Year-Old Who Has Intellectual Disabilities,distinctive Facial Features,and

Multiple Choice

Dr.Pierce examines a 10-year-old who has intellectual disabilities,distinctive facial features,and an extra 21^st chromosome.Given this information,Dr.Pierce's diagnosis would most likely be

A) PKU.
B) XYY syndrome.
C) Down syndrome.
D) anencephaly.