Whatever contribution you choose to discuss as part of your answer, you need to ensure it is relatable to the company and role you are interviewing for. Answering this question is the perfect opportunity to stand out from other job seekers. Read over the job description and make a note of the company's needs. Try to identify examples from your education, skills, accomplishments, and experience valuable to the specific company. You'll be far more likely to get hired if you show your knowledge about the company culture and role expectations and relate your past successes to the job. Think of an answer that shows your abilities to not only handle challenges at work but also proactively plan ahead to prevent challenges from occurring in the first place. Discuss how you went above and beyond to ensure that your contribution made a difference.