Advertisements for hygiene products such as toothpaste and mouthwash tend to feature doctors as spokespersons endorsing the products. Consumers perceive these doctors to possess a substantial knowledge on health and hygiene. Which of the following characteristics of the message source is represented by this example?

A. Expertise
B. Perception
C. Congruity
D. Visibility

Advertising is the use of paid messages to communicate with the end-users of a product or service. Advertising seeks to create or increase the demand for goods and services. It informs consumers of the features and benefits of using a particular product, thereby enticing them to buy.

Sometimes marketers get experts or professionals to endorse a product or a service as a way of advertising. When an expert or a satisfied customer vouch for the effectiveness of a product, customers tend to get convinced. The advert achieves its purpose of increasing sales.