A doctor advised a person to take an injection of insulin because

A doctor advised a person to take injection of insulin because:

A doctor suggested a person to take ORS. That person might be suffering from

A doctor suggested a person to take ORS. That person might be suffering from

A doctor advised a pregnant lady not to take any medicines without consulting him especially for the first three months. Give reason.

Name the glands that secretes insulin. Why are some patients of diabetes treated by giving injections of insulin ?