Define your business in terms of markets and benefits, not services

When someone asks: "What do you do?," the temptation is to describe the product or service you offer. That's understandable, because you're so close to the product or service you offer.

The problem is, this leads to weak answers, i.e.: "I'm a marketing consultant that teaches firms how to market their services using newsletters."

However, a better alternative is to couch your expertise in specific terms, i.e.: "I help veterinarians and other professionals cut marketing costs and retain their best clients."

If you're a veterinarian, which of the above two answers would you be more likely to respond positively to?