Help with creating an xls file with options

1. What is the problem? Be very detailed.
I am very new to odk. My problem is in one question I have three responses (Right, Left and NA). I want the user to choose either (Right or Left) or NA. Can anyone help
2. What app or server are you using and on what device and operating system? Include version numbers.
odk collect v1.24.1
3. What you have you tried to fix the problem?
Cannot understand
4. What steps can we take to reproduce the problem?

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

check this document: