What Deficiency does the below rebus represent?

VIT_MIN

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

How many triangles are there on the puzzle below?

Can you count the number of triangles in the given figure?

What is next number in the pattern below:

131 517 192 123 ?

When it is alive we sing, when it is dead we clap our hands. What is it?

If a wheel has 54 spokes, how many spaces are there between the spokes?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Can you decipher the two rows to find the hidden word?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.