The logic followed is:
In biological terms, a human being, or human, is any member of the mammalian species Homo sapiens, a group of ground-dwelling, tailless primates that are distributed worldwide and are characterized by bipedalism and the capacity for speech and language, with an erect body carriage that frees the hands for manipulating objects.
The most vital organ for survival are:
Humans have five vital organs that are essential for survival. These are the brain, heart, kidneys, liver, and lungs.
The human brain is the body's control center, receiving and sending signals to other organs through the nervous system and through secreted hormones. It is responsible for our thoughts, feelings, memory storage, and general perception of the world.
The human heart is responsible for pumping blood throughout our body.
The job of the kidneys is to remove waste and extra fluid from the blood. The kidneys take urea out of the blood and combine it with water and other substances to make urine.
The liver has many functions, including detoxifying harmful chemicals, breakdown of drugs, filtering of blood, secretion of bile, and production of blood-clotting proteins.
The lungs are responsible for removing oxygen from the air we breathe and transferring it to our blood where it can be sent to our cells. The lungs also remove carbon dioxide, which we exhale.
So, humans can survive without eyes, nose, hands but the heart is the most vital organ without it we cannot survive.
Hence, the correct answer is "Heart".