I have one extra field's dropdown list (Cars Make), and depending on the user's choice in that one, a second dropdown gets filled with choices (Cars Model). This awesome extension is exactly what I was looking for and did the job perfectly.
This is the best slideshow module for K2. It is the first slideshow module that works for me exactly as the demo. This module is also a developer friendly and is developed in a clean way so you can modify it very easily.