You need an 'if' statement which displays different answers depending on what you set the condiions to be.

If you wanted an answer of 'Buzz Aldrin' in B2 then you would need to input =IF(B2="Buzz Aldrin";"correct";"wrong&quot The bit in black is where the rule goes (just replace the cell and the answer), the red is the answer if the cell is filled with 'Buzz Aldrin' and the other colour which i cannot remember is the part where you put the answer if they have got it wrong.

You might need commas instead of the semi-colons, im not sure as i'm using open-office not microsoft excel

Hope this helps and i hope its right.