Human beings use several mechanisms for the excretion of waste materials from their bodies. These mechanisms include exhalation, perspiration, and defecation. However, transfusion is not used for excretion and is therefore the correct answer.

Explanation:

Exhalation:
- Exhalation is the process by which humans expel waste gases, primarily carbon dioxide, from their bodies.
- During respiration, oxygen is taken in and carbon dioxide is produced as a waste product.
- The carbon dioxide is transported through the bloodstream to the lungs, where it is eliminated by exhaling.

Perspiration:
- Perspiration, also known as sweating, is another mechanism used by the human body to excrete waste materials.
- When the body gets too hot, sweat glands produce sweat, which is primarily composed of water, salt, and small amounts of other waste products.
- Sweating helps to regulate body temperature and eliminates waste substances from the body.

Defecation:
- Defecation is the process of eliminating solid waste materials from the body through the rectum and anus.
- It involves the removal of undigested food, fiber, and other waste products from the digestive system.
- The waste material, known as feces, is formed in the large intestine and is expelled from the body during a bowel movement.

Transfusion:
- Transfusion is not a mechanism for excretion but rather a medical procedure involving the transfer of blood or blood components from one person (donor) to another person (recipient).
- It is used to replace blood lost due to injury, surgery, or certain medical conditions.
- Transfused blood does not play a role in excretion but rather in replenishing blood volume or providing necessary components such as red blood cells or platelets.

In conclusion, out of the given options, transfusion is not used as a mechanism for the excretion of waste materials from the human body. Exhalation, perspiration, and defecation are the correct mechanisms for waste excretion.

It is transfusion because humans excretory system consists of anus large intestine small intestine and transfusion is a process of puttin new blood in ones body due to illnes