1099-R

2020 first yr retired as public safety officer and collected disability pension income.  Box 5 has an amount and TurboTax asks confusing quesions about it being a rollover, etc.  I used time on books as contributions to 401/457 maximums, and left over money was paid to me, shown on separate W-2.  Plan Administrator did deduct my medical premiums from disability income throughout the year.  I didn't rollover or convert any money.  When it asks about "periodic payments" is this referring to my pension income or 401/457 plan?  Thanks in advance for your help!