What is a safe answer for the 'Reason for extension' on the TM 7 visa extension form in Thailand?

When filling out the 'Reason for extension' on the TM 7 visa extension form in Thailand, many users suggest that a simple, straightforward answer such as 'retirement' is sufficient. Various anecdotes indicate that the specifics of the explanation are not heavily scrutinized; what's more important is having the right supporting documentation. Some expats recommend avoiding terms that imply working on a tourist visa and suggest using one-word responses like 'Tourism' or 'Study'. Overall, it seems the content of the response is less critical than the applicant's eligibility and paperwork.