Encrypt columns of sensitive data

In a questionnaire of my office, there is a sensitive question that answered by respondents must be encrypted. So, except my office, also some other offices will have access to this Survey Solution server via API in order to monitor the progress in the field.

How is it possible to encrypt this sensitive question?
Hope I was clear in my question

Not exactly. Could you please elaborate how your situation is different from this:

The question is similar.
Thank you so much Sergiy for your fast answer.