This question is similar to the 'what is your greatest strength' question. The interviewer wants to hear what you consider your greatest asset as it applies to the position. Review the job announcement and see what keywords are used for their ideal candidate under job requirements or qualifications. If the company is looking for an experienced vascular technologist with strong communication skills, excellent technical writing skills, and analytical skills, you will choose one of those as your best asset. Give an example of how your greatest asset will be beneficial to their organization.