Magento 1.9.1 on option change additional information is not change

[NRB1234]

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.

Can any one tell me why it will not change and how to fix this issue? Any extension is available for that?

[Elsner_Tech]

In magento by default there is configurable option changes the price , but as you have mentioned that additional information should also change as you change the option this feature was not given by magento bydefault and this is not an issue,If you want to do this functionality you need to customize your site.