What Deficiency does the below rebus represent?

VIT_MIN

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

Which wheel of car does not rotate when you turn your car right?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Can you make a fire with just a single stick?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?