Water, fat or calcium?

Question

I need to fill in the blank:

The most abundant chemical substance in the human body is _____.

i am prettty sure its either water, calcium or fat, but i am not sure of the correct answer. i am in anatomy, if that helps. any help is appreciated.

Answer 1

H2O (water)

  

The body is approximately 80% inorganic water. Water is a common chemical substance that is essential for the survival of all known forms of life. Since water is the most common molecule in the human body, it should be no surprise that water is the most abundant solvent.

Answer 2

Water.