Image touch selection area

We are developing image mapping for education. The teacher can add question with image. The schema answer is based on the image touched selection by the teacher.

For example;

• Which are the area represent district that having gold. then the teacher can choose the correct answer(B and E district) by pressing the schema answer at picture

The question are

1. As a teacher how to do the schema answer with touching the image and what value to store into database
2. As a student how student can press the correct answer

Anyone can suggest or help me?

I'm newbie in android..

Thanks!