I am thinking of a prime number, either 7 or 13 or 17 or 19.
You can ask me only one question to which the answer I give must be either 0 or 1 or 2 or 3. Can you then tell what number I am thinking?
Conditions: Please don't ask a question on the progression order of the numbers like "If you consider 23 as the 4th number in a progression of Prime numbers, and discard 11, what progression number will you get". In this case 19 would be 3rd, 17 would be 2nd etc. Also you cannot assign values to the 4 numbers. For example "If 7 is 0, 13 is 1, 17 is 2 etc" - that will be too simple.