How do I answer the question "What kind of retirement income do you have from Pennsylvania?" Box 7 has code 4

Hello, I received a TSP distribution in 2024 from the death of an older sibling.  I am working on the PA state taxes and TurboTax is asking “What kind of retirement income do you have from Pennsylvania?”. Box 7 of my 1099-R has code 4.  How do I answer this question in TurboTax?  This is my first time receiving a distribution and I am not at retirement age (under 59 1/2 still), but many websites say that TSP distributions are not taxable in PA.  Is this also true?  


Thank you for your help with this.