In Magento 1.9.1 whenever I will change the product option from the dropdown the product price and availability will change but the additional information is not changed.
I want if user change the drop-down then the additional information of that particular product also change.
![screenshot](https://i.stack.imgur.com/uHsOr.png)
Can any one tell me why it will not change and how to fix this issue? Any extension is available for that?