Answer:
categorical or qualitative variable
Explanation:
The gender in the questionnaire will be a variable that will serve as a qualitative or categorial indicator for indexing the answers of the questionnaire.
The qualitative variables usually represent something that cannot be measured by numbers and is a trait or characteristic representative that will account as an important variable in the study.
IF asked how many men and woman are working and studying together, there will be likely a gender study that will favour one or the other sex, in case that this is considered relevant for the research.
While in other studies there are variables that are measured through numbers, the categorical studies focus on the non-measurable aspects of the relationship among several characteristics