The answer can say a lot to the questioner, in both content and tone, but it should also say a lot to YOU.
Do you notice how you answer the question?
Do you use vague generalities? "I am in general practice.....I do a lot of different things.....I work for a small firm......".
Do you give a self-deprecating answer? How would you view someone who defined themselves as doing something they hated?
Are you enthusiastic? Could you be? About something that you do?
Here are some basic suggestions:
1. OBSERVE how you answer that question.
2. THINK about what it indicates: (a) to the questioner, and (b) to yourself.
3. Experiment with some different ways to answer, first by thinking of some, and then trying them out when asked (btw, you will be amazed how many opportunities you have to answer the question). Then, follow the above.....observe your response, and THINK about what it indicates to the hearer and to yourself.
4. Keep refining how you define, it will move you in the right direction.
You will also notice that specificity, and saying that you focus on SOMETHING(s) improves your approach to practice, and results in new, QUALITY business........