Boolean ? in SQL (2005) table

I was wondering what should be used for a yes/no/ entry identifier . Should it be a simple int , tinyint , or uniqueidentifier?

Thank you

The bit data type is for values that can be either 0 or 1, such as No/Yes or False/True.|||The way you have written your answer suggests that 0 =yes and 1 = no which goes against my common sence. Could you clarify. I am sorry if this seams a bit picky.|||

No problem:

0 --> No, False

1 --> Yes, True

sql