Multiple choice question logic

@NickyH - welcome to the community from another user

the way to do this at the moment, given the nature of the application, is to have logic branching/calculation set up on your question along this line .. i am assuming this is Q1 in the series for ease 

• on q1 you have the following logic rule:
  • if q1 = c (i don’t eat either of these) And q1=A and q1=B then jumpto S1 (a statement page)
  • if q1=c AND q1=a then jumpto S1
  • if q1=c AND q1=B then jumpto  S1
  • otherwise jumpto q2
• on S1, the statement page you put a message that says something like “you cannot choose I don’t eat either of these” AND one or more of the choices. Please return to the question and make an appropriate choice”
  • set the logic rule to always jump to q1 - forces them to go back and make the correct selection 

does that help??

des