So I gave a quiz with various different questions types today. I gave a matching question for countries and their capitals and I used several cities as distractors which meant that the list of words to choose from was about 12 items long. If the student tried to click on the scroll bar to scroll down the list, it would just close the dropdown list. They had to use their mouse wheel or a two-finger scroll on a trackpad to get it to scroll down the list. This was mostly Chrome users on Windows 8.1. I didn't try it in another browser.