Many experienced professionals are sometimes considered as one-man-shows that can carry out tasks for the business or the company on an individual level.
If you are considered for post where you would have to work alone, you should consider whether you would be able to work in a quite environment.
For example, people who like to go it alone are and should be able handling specific set of skills, being individual players, sometimes multi-talented and might need managerial qualities or knowing how to manage themselves with minimal supervision.
You should keep in mind that working alone might require handling more pressure. Therefore, the interviewer may also ask about your ability to work under pressure.