Question：In which of the following decision-making scenarios would an expert system be beneficial?

　　A. Updating a forecast to take into account latest sales figures.

　　B. Creating a new pricing structure.

　　C. Cost benefit analysis of potential investment options.

　　D. Medical diagnosis.

　　E. Advising a client on the best mortgage option available.

　　The correct answers are: Advising a client on the best mortgage option; Medical diagnosis.

　　For both of these decisions, there are specific rules to be applied, which could be contained in the knowledge base of an expert system; the user will look at the options generated based on each individual case and advise accordingly. The other decisions would be better served by a decision support system.