Hodgkin disease is:

A. Oxygen delivery to tissues is the primary function of the circulatory system, not the lymphatic system.
B. Thermoregulation is primarily carried out by the circulatory system and other mechanisms like sweating, not the lymphatic system.
C. The transport of absorbed amino acids from the intestine to the liver is a function of the circulatory system, specifically through the hepatic portal vein, not the lymphatic system.
D. The lymphatic system is involved in the absorption of digested fats through specialized lymphatic capillaries called lacteals in the small intestine. These lacteals absorb fats and transport them into the lymphatic circulation.

A. The spleen does not shrink after puberty. It remains an active part of the immune and blood filtration systems throughout life.
B. The thymus (note: it appears misspelled as "Thygus" in the question) is the correct answer. It plays a crucial role in the development of T lymphocytes (T cells) during childhood but begins to shrink and become replaced by fatty tissue after puberty—a process known as involution.
C. The liver does not shrink after puberty. In fact, it continues to grow and function in metabolism, detoxification, and digestion throughout a person’s life.
D. The cisterna chyli is a dilated sac at the lower end of the thoracic duct involved in lymphatic drainage. It does not shrink after puberty and remains functional throughout life.