What Deficiency does the below rebus represent?

VIT_MIN

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

No matter how little or how much you use me, you change me every month. What am I?

I have Rs.50 and I spend it in the way as below.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

What can you catch but never throw?

Take one out and scratch my head, I am now black but once was red. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?