1. No comment.
2. I'm not at liberty to say. (= I don't have permission to give the information)
3. Wait and see. (= you will discover the answer later)
4. Let me get back to you. (= I will give you the answer later)
5. I'm sorry, that's confidential.
6. I'm sorry, that's personal.
7. I'd rather not talk about it.
8. It's none of your business.
9. Mind your own business.
10. Why do you want to know?
#8 and #9 are rather rude – telling the other person to stop inquiring about your life

Science Facts
Scabs are formed when chemical proteins react with special blood cells called platelets, which cause the blood to get sticky and clump together. Once you've clotted, lots of different chemicals and cells work together to dry out the clot and form a scab, keeping out germs while the cells underneath repair themselves. So, if you pick a scab you're messing with all your body's hard work!      .. More >>