Son : Father, I have a sore throat. I cannot swallow the food.
Father : Have you taken medicine?
Son : Yes but it doesn't get better.
Father : Now you should go to a doctor.
Son : No, I am afraid of a doctor.
Father : But why?
Son : I don't want to be injected.
Father : But you have to.
Now, ask Mother to take you to doctor.

What does his father suggest his son should do?