I think it depends on how the question is answered. For instance, if you ask me my favorite in terms of the journal to publish my work, I can tell you that I like publishing in an education-based journal indexed in Scopus without mentioning that specific journal. I think it depends on being creative with one' s response to such question.
It depends on what data sets you reveal in the answer or are required by the question. Additionally let's assume that the person/system asking the question does not know who you are beforehand, so you have not introduced yourself nor are you logged in with your personal information. Now, with this assumption that by the point of answering the question you are indeed anonymous you can remain that way as long as you do not uncover any data-sets categorized as personal data - First name, last name, date of birth, personal e-mail address, physical address, photo, etc. As long as you stick to answering with i.e. "My favorite fruit is bananas." there is no actual way of knowing that YOU like bananas, but rather you provided data that can benefit a poll or some other statistical goal where your answer will contribute towards a higher rank of bananas. Maybe the example is not the best one but I hope it gets the message across.
Summary: You are in control of what data you give, as long as you do not indetify yourself with personal data sets, your privacy is maintained Zeyad Mohammad .