The correct option is
A Genetic disorder
Haemophilia is an inherited genetic disorder that impairs the body's ability to promote blood clot formation. The formation of blood clots is necessary to stop bleeding. This results in people bleeding longer after an injury, and an increased risk of bleeding inside joints or the brain. There are two main types of haemophilia i.e., haemophilia A, which occurs due to insufficient clotting factor VIII, and haemophilia B, which occurs due to insufficient clotting factor IX. They are typically inherited from one's parents through an X chromosome with a nonfunctional gene.
So, the correct answer is 'Genetic disorder'.