Lymph from which of the following parts of the body does not enter into the systemic circulation through the thoracic duct?

A. An antigen is any foreign substance (such as bacteria, viruses, or toxins) that triggers an immune response in the body. The immune system recognizes and responds to antigens, typically by producing antibodies.
B. Inflammation is a response of the body to injury or infection, characterized by redness, heat, swelling, and pain, but it is not a foreign substance itself.
C. An allergen is a specific type of antigen that causes an allergic reaction. While all allergens are antigens, not all antigens are allergens.
D. A lymphocyte is a type of white blood cell involved in the immune response, but it is not a foreign substance. Lymphocytes help recognize and respond to antigens.

A. Tracheobronchial nodes are located near the trachea and bronchi in the chest and drain lymph from the lungs and airways, not from the arm or breast.
B. Axillary nodes are located in the armpit (axilla) and drain lymph from the arm, breast, and upper chest. They are a key part of the lymphatic system for these regions.
C. Inguinal nodes are located in the groin and drain lymph from the lower limbs, external genitalia, and lower abdomen.
D. Cervical nodes are located in the neck and drain lymph from the head and neck region, not from the arm or breast.