Need micro:bit python code.

How to make random math game on micro:bit, generate random number by answering using the 'a' as correct answer and 'b' is wrong answer buttons so that micro:bit will know that the user will give the right or wrong answer?

mainly what to put in the code here?

"if button_a.was_pressed():

???

if button_b:was_pressed():

???"

The user need to answer a or b.