Which statement below is incorrect regarding hemophilia A?

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Hemophilia A results from a deficiency in factor VIII.Females typically act as carriers in hemophilia A.Desmopressin is an effective treatment option for hemophilia A.Spontaneous bleeding occurs when factor VIII levels fall below 50%.Hemophilia A is inherited as an X-linked recessive disorder.

Explanation

Hemophilia A is caused by a deficiency of factor VIII, and females usually serve as carriers. Desmopressin is a useful therapy for mild cases. However, spontaneous bleeding typically happens when factor VIII levels drop below 1%, not 50%. Therefore, the statement about bleeding occurring below 50% factor VIII is incorrect.