Here interviewer indirectly asking that are you a good decision maker or not. The interviewer may ask you to define the meaning of critical thinking and to assess the importance of it to the decision making process. Or do you have the ability to make important decisions or not or to know how you'd handle challenging and stressful situations and how strong your critical thinking skills. This is your chance to show that you're up to the task of making good decisions in challenging situations. So start with a story that shows you were successful in solving a tough problem and that shows a positive result for your boss and the business.