This app was mentioned in 7 comments, with an average of 3.14 upvotes
Office Remote for Android. Requires Bluetooth on both phone and PC, running Office 2013 or 365 and with an istalled add-ins. Very simple to connect, and once it is connected just open the required office documents in the PC, tell the Remote app in the phone what document you want to control, then you're done. Very simple compared to other remote apps.
Well, there is office remote: https://play.google.com/store/apps/details?id=com.microsoft.office.officeremote&hl=en
Which sounds like it does a lot, but what if you have the question on slide 1, and the answered question on slide 2.
Then show slide 1, discuss with the class and when you are ready, advance to slide 2?
By the way, this only works local, you need a laptop with Bluetooth and at least office 2013 to use Office Remote.
It is possible on Android and Windows Phones.
You will have to check for yourself to see if you can do this on iOS.
What about Office Remote for Android? I believe you can use it as a clicker
https://play.google.com/store/apps/details?id=com.microsoft.office.officeremote