**Core Concept**
The patient presents with a history of frequent nasal bleeding (epistaxis), which is a common symptom of a bleeding disorder. The laboratory findings of normocytic hypochromic anemia suggest a defect in erythropoiesis or iron metabolism.

**Why the Correct Answer is Right**
The most probable diagnosis is Hereditary Hemorrhagic Telangiectasia (HHT), also known as Osler-Weber-Rendu syndrome. This genetic disorder is characterized by the formation of abnormal blood vessels (telangiectasia) in various organs, leading to recurrent bleeding episodes. The nasal mucosa is a common site for these telangiectasias. The patient's normocytic hypochromic anemia is likely due to chronic blood loss. **Option C** is the correct answer because HHT is a known cause of recurrent epistaxis, particularly in adolescents.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because hereditary spherocytosis is a disorder of red blood cell membrane, which typically presents with spherocytic red blood cells, jaundice, and splenomegaly. While it can cause anemia, it is not associated with recurrent epistaxis.

**Option B:** This option is incorrect because von Willebrand disease is a bleeding disorder that affects platelet function and von Willebrand factor. While it can cause mucocutaneous bleeding, the presentation is typically different from HHT, with more prominent symptoms of easy bruising and prolonged bleeding after trauma or surgery.

**Clinical Pearl / High-Yield Fact**
Recurrent epistaxis in a young patient should prompt a search for underlying bleeding disorders, including HHT. A family history of similar symptoms and a physical examination for telangiectasias can aid in the diagnosis.

**Correct Answer:** C. Hereditary Hemorrhagic Telangiectasia