Which of the following is NOT an example of a congenital disorder?

The selected answer, a head injury, is not an example of a congenital disorder because congenital disorders refer to conditions that are present at birth, typically resulting from genetic or environmental factors that affect the development of the fetus during pregnancy. A head injury occurs after birth due to trauma, which does not fall under the category of congenital conditions.

Congenital disorders can manifest in various forms, such as genetic disorders like cystic fibrosis or structural issues like heart defects that originate during fetal development. Birthmarks also fall into this category as they appear at birth or shortly after and are not a result of external factors post-delivery. Understanding this distinction helps clarify the definition of congenital disorders and highlights that they are inherently related to conditions existing at the time of birth rather than those resulting from subsequent events like injuries.