Select the incorrect statement with regard to haemophilia.

Haemophilia is a X-linked recessive trait which shows transmission from carrier female to male progeny. Single protein is affected in this condition. The three main forms of hemophilia include the following: Hemophilia A: Caused by a lack of the blood clotting factor VIII; approximately 85% of hemophiliacs have type A disease. Hemophilia B: Caused by a deficiency of factor IX. Hemophilia C: Some doctors use this term to refer to a lack of clotting factor XI.