Which characteristics are indicative of oily skin?

Oily skin is primarily characterized by an overproduction of sebum, which leads to certain distinctive traits. Enlarged pores are a common feature of oily skin as the excess oil can cause them to appear larger. This is often accompanied by a shiny appearance on the skin's surface, particularly in areas like the forehead, nose, and chin, commonly referred to as the T-zone.

In contrast, the other characteristics listed indicate different skin types or conditions. Dry patches and flaky areas suggest dryness rather than oiliness. Likewise, rough texture and redness could indicate irritation or conditions such as eczema, while sensitive areas and irritation typically relate to reactive or sensitive skin types. Therefore, the combination of enlarged pores and a shiny appearance is a clear indicator of oily skin, making it the correct choice.