**Question:** Following statement is true for hemophilia patients?

A. Hemophilia patients have normal blood clotting ability.
B. Hemophilia patients have increased bleeding tendency due to impaired platelet function.
C. Hemophilia patients exhibit bleeding tendency due to deficiency in factor VIII or IX proteins.
D. Hemophilia patients do not require specific blood products for hemostasis.

**Correct Answer:** C. Hemophilia patients exhibit bleeding tendency due to deficiency in factor VIII or IX proteins.

**Core Concept:** Hemophilia is a genetic disorder characterized by an inherited deficiency in clotting factors, specifically factor VIII in hemophilia A and factor IX in hemophilia B. These clotting factors are proteins essential for the blood clotting process, specifically in the intrinsic pathway of blood coagulation.

**Why the Correct Answer is Right:** The correct answer (C) highlights the key aspect of hemophilia, which is the deficiency of clotting factors VIII or IX. These factors are crucial for the intrinsic pathway of blood coagulation, leading to impaired clot formation and increased bleeding tendency in hemophilia patients.

**Why Each Wrong Option is Incorrect:**

A. Hemophilia patients have normal blood clotting ability (wrong): Hemophilia is a genetic disorder, and the correct answer highlights the deficiency of clotting factors in these patients. It does not imply normal clotting ability.

B. Hemophilia patients have increased bleeding tendency due to impaired platelet function (wrong): The main issue in hemophilia is the deficiency of clotting factors, not platelet dysfunction. While platelets do play a role in clot formation, the primary cause of bleeding in hemophilia is the absence or insufficient levels of clotting factors VIII or IX.

D. Hemophilia patients do not require specific blood products for hemostasis (wrong): Hemophilia patients do require specific clotting factor concentrates (e.g., factor VIII or IX) to control bleeding episodes and facilitate proper clot formation.

**Clinical Pearl:** Hemophilia is a critical aspect of hematology, particularly in understanding the pathogenesis of bleeding disorders. This knowledge is essential in formulating an appropriate treatment plan, including clotting factor replacement therapy, for hemophilia patients to prevent excessive bleeding and improve their quality of life.