Python+Input+Validation+(H)

Input validation is one of three standard algorithms you learned at National 5.

The algorithm is:

1-ask user for value 2-get value as input 3-repeat until value is valid 4-ask user for value 5-get value as input 6-end repeat

Code
**Extension Task**

Write a program which asks the user a single multiple choice question. The program should use input validation to ensure only A, B, C or D are entered.