Choice A rationale:

 Consulting with the healthcare team to address underlying medical conditions (Choice A) is the most appropriate nursing action for a client with a pressure ulcer and signs of infection.

Pressure ulcers can develop or worsen due to underlying medical conditions such as diabetes, vascular disease, or immunosuppression.

Addressing these underlying conditions is essential for effective wound management and preventing further complications.

Choice B rationale:

 Encouraging frequent position changes and mobility exercises (Choice B) is a valuable intervention to prevent pressure ulcers, but in a client with an existing pressure ulcer and signs of infection, addressing the infection and underlying medical conditions take precedence.

Choice C rationale:

 Using specialized mattresses to offload pressure (Choice C) is an important part of pressure ulcer prevention and management, but it may not be the most immediate action needed for a client with signs of infection.

Addressing infection and underlying medical conditions (Choice A) should be the priority.

Choice D rationale:

 Providing education on proper wound care and prevention strategies (Choice D) is an essential nursing action but may not be the most immediate priority for a client with an active infection.

Managing the infection and addressing underlying medical conditions (Choice A) should come first.