Which of the following is an example of nominal (frequency) data?

Nominal data, also known as categorical or frequency data, refers to data that can be classified into distinct categories without any quantitative value or ranking. An example of this is differentiating between men and women, which simply categorizes individuals into two groups based on gender. Each group is mutually exclusive, and there is no inherent order or numerical value associated with these categories.

In contrast, temperature and weight are examples of continuous data, which can be measured on a numerical scale and possess a meaningful order. Rank in class represents ordinal data, where there is a clear ranking or order among the categories (such as first, second, third, etc.), but the differences between the ranks may not be uniform or quantifiable. Thus, the correct choice exemplifies the nature of nominal data as it categorizes individuals without implying any quantifiable relationship.