Inhibit sub-question of multi choice based on other sub questions checked - by: ctdh

Hi
I have a 'simple' issue I am struggling with...
A multi choice question:
Q1_SQ1 Choice A
Q2_SQ1 Choice B
Q3_SQ1 Choice C

I would like to be able to disable choice C if either A or B are selected

Can I do this in LS 2.00?

Thanks
Charles