How to create custom MCSS activity in adobe captivate 8

Hello Everyone,

I want create custom multiple choice single select question for one of my project.

Client want use two images rather than radio buttons and after selecting any one image learner able to click submit button and get appropriate correct or incorrect feedback.

So is it possible in adobe Captivate 8?

How to convert slide into freeform Question (MCSS)?

How to use image as radio button?

Thanks & Regards

Akash Jambhorkar