nightmare question

possible question: what are your weaknesses?

ive been thinking a lot as to how i would answer this, and i think i would say something along the lines of:

i sometimes find it hard to delegate tasks to other people and take on too much (if you want something doing, do it yourself...). since i became a prefect however this has changed.

i don't want to sound like a contol freak, but this question is a potential mindfield anyway. any advice as to whether this would be a good response?