Currently, if you select an answer that produces a follow-on question, answer the follow-on question, deselect the answer that produced this follow-on, then reselect, the data you entered in the follow-on question is preserved. For instance, if you select Other, enter free text, deselect Other, and then select it again, the free text you entered is preserved. Ideally, this would not happen; hiding the follow-on question would clear the data entered in it.
Currently, if you select an answer that produces a follow-on question, answer the follow-on question, deselect the answer that produced this follow-on, then reselect, the data you entered in the follow-on question is preserved. For instance, if you select Other, enter free text, deselect Other, and then select it again, the free text you entered is preserved. Ideally, this would not happen; hiding the follow-on question would clear the data entered in it.