Which of the following is made up of Calcium?

Which of the following is made up of Calcium?

مندرجہ ذیل میں سے کون سی کیلشیم سے بنا ہے؟
Explanation

Teeth is made up of Calcium.

Calcium hydroxide is an odorless white powder.

It's used in industrial settings, such as:

sewage treatment,

paper production,

construction,

and food processing