What is the purpose of exporting :r and :c questions for Drill application?
Use the "Export Questions for Drill" feature if you want to allow students to practice the material using Drill application. The export can be found in the application:

Information System Teacher [course selection] Work with ROPOT Export Questions for Drill

Use the form provided to find the question set you want to export and confirm with the "Use" button.

The export application allows you to export the questions including all options in CSV format, which you then use as a data file for importing into the drill. Exporting for drill is only suitable for :r and :c questions where students do not need to know the exact answer but are able to select it from the options provided.

We recommend that you use the drill export only for questions that contain some factual knowledge. You can learn more about drill application in the Help

Information System Help Drill – spaced repetition

and in the question: How do I import data from the answer sheet into the drill?