Question

which of the following is the most common cause of mental retardation in newborns?
○ a. downs syndrome
○ b. head injury
○ c. prenatal malnutrition
○ d. fetal alcohol syndrome

Explanation:

Down's Syndrome is a genetic disorder caused by the presence of an extra chromosome 21. It is a well - known and common cause of mental retardation in newborns. Head injury is more of an acquired cause later in life rather than a common cause at birth. Prenatal malnutrition can have negative effects, but it is not as common as Down's Syndrome as a cause of mental retardation in newborns. Fetal alcohol syndrome is also a significant cause but is not as prevalent as Down's Syndrome.

Answer:

a. Down's Syndrome