I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

What do you think with the below Picture ?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What is the coolest letter in the alphabet?

What does Alexander the Great and Winnie the Pooh have in common?

How is the moon similar to a dollar?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

There was a strange boy who was born before his father. How can this be possible?

How can you tell a raw egg from a hard-boiled egg?