Which substance is known for repelling both water and oil?

The chosen option is lipophobic substances, which are specifically known for their inability to interact with oils and lipids, leading to their repellent nature toward these substances. The term "lipophobic" implies that these substances do not mix well with fats, oils, or lipids, which is significant for applications such as coatings or materials designed to resist grease or oil penetration.

While lipophobic substances repel oil, they may or may not have similar properties toward water. Lipophobicity can contribute to a broader category of behaviors depending on the specific characteristics of the substance. In many contexts, substances that repel both water and oil are referred to as amphiphobic, but lipophobic items contribute to that category, particularly where oil interaction is concerned.

Understanding the nature of lipophobic substances is essential in various fields, such as material science, coatings technology, and environmental chemistry, where the control of interactions with oils and water is critical for performance and functionality.