The category of a question is determined by the subject or topic of the question. It helps to classify and organize questions based on their content and purpose. Some common categories of questions include:

1. Informational questions: These questions seek factual or objective information. For example, "What is the capital of France?" or "How old is Barack Obama?"

2. Opinion-based questions: These questions ask for personal opinions or subjective viewpoints. For example, "What is your favorite book?" or "Do you think climate change is a serious issue?"

3. Yes/No questions: These questions can be answered with a simple "yes" or "no" response. For example, "Is it raining outside?" or "Did you finish your homework?"

4. Open-ended questions: These questions require more detailed and thoughtful responses. They encourage discussion and allow for a variety of answers. For example, "What are your thoughts on the current political situation?" or "How would you solve the problem of poverty?"

5. Problem-solving questions: These questions require critical thinking and problem-solving skills. They often present a scenario or challenge and ask for a solution. For example, "How would you reduce traffic congestion in a busy city?" or "What steps would you take to improve customer satisfaction in a business?"

6. Hypothetical questions: These questions ask about imaginary or hypothetical situations. They often explore possibilities and potential outcomes. For example, "What would you do if you won the lottery?" or "If you could travel back in time, which historical event would you like to witness?"

These are just a few examples of question categories, and there can be overlap between them. The category of a question helps to determine the type of answer it requires and the approach needed to respond effectively.