The correct answer is: B. Nose
Rhinitis is a condition that affects the nose. It is characterized by inflammation of the nasal passages, which can cause symptoms such as sneezing, runny nose, congestion, and itching. Rhinitis can be caused by a variety of factors, including allergies, viruses, and bacteria.
Option A: The brain is not directly affected by rhinitis. However, rhinitis can cause symptoms such as headache and fatigue, which can indirectly affect the brain.
Option C: The blood is not directly affected by rhinitis. However, rhinitis can cause inflammation of the nasal passages, which can lead to increased blood flow to the nose.
Option D: The skin is not directly affected by rhinitis. However, rhinitis can cause symptoms such as sneezing and runny nose, which can irritate the skin around the nose.