Peyer patches are part of which of the following?

A. Blood contains various types of cells, such as red blood cells and white blood cells, but dust cells are not found in the blood.
B. Dust cells are a type of macrophage found in the lungs. They are responsible for engulfing and clearing inhaled particles, dust, and pathogens from the respiratory system.
C. The liver contains Kupffer cells, which are macrophages that filter blood, but dust cells are not found in the liver.
D. The small intestine contains various immune cells, but dust cells are not among them. The small intestine has its own specialized immune cells like Peyer's patches.

A. Plasma refers to the liquid component of blood, not tissue fluid.
B. Chyle is a specific type of lymph that is rich in fats, typically absorbed from the intestines, and not the general fluid that enters the lymphatic vessels.
C. Lymph is the correct answer. It is the fluid that forms when tissue fluid enters the lymphatic vessels. Lymph is derived from interstitial fluid and contains water, proteins, waste products, and immune cells.
D. Serum is the liquid portion of blood without clotting factors, but it is not related to the lymphatic system.