Correct Answer: C

Rationale: The correct answer is C: 'Poor lighting.' External factors such as lighting can significantly impact the learning environment, making it difficult for participants to engage effectively. Poor lighting can strain the eyes, cause discomfort, and lead to decreased concentration. Choices A, B, and D are internal factors or issues that are not directly related to the learning environment. High workload, limited knowledge on the subject, and limited space in the learning area may affect learning differently but do not impede learning through external factors like poor lighting does.

Correct Answer: A

Rationale: The correct answer is to use a separate washcloth for the child. This is important to prevent the spread of infection when a child has conjunctivitis. Using the same washcloth can lead to cross-contamination and further spread of the condition. Applying cold or warm compresses may provide comfort but do not address the prevention of spreading the infection. Keeping the child home until symptoms have resolved may be necessary, but the primary focus should be on preventing the spread of the infection within the household.

Correct Answer: A

Rationale: The correct signs and symptoms of Cushing's syndrome are weight gain and a moon face. Corticosteroids are used to manage Cushing's syndrome by reducing the overproduction of cortisol. Choice B is incorrect because hirsutism and thin extremities are not typical signs of Cushing's syndrome. Choice C is incorrect as purple striae and muscle weakness are more characteristic of the syndrome. Choice D is also incorrect as hypertension and bruising are not primary signs of Cushing's syndrome.

Correct Answer: A

Rationale: The correct answer is A: Clean the wound and apply a hydrocolloid dressing. This step is crucial in managing a pressure ulcer as it helps protect the ulcer from infection and promotes healing by creating a moist environment conducive to tissue repair. Choice B, debriding necrotic tissue and applying antibiotics, is more suitable for managing infected pressure ulcers but not as the initial step. Choice C, applying an alginate dressing and elevating the affected area, may be part of the management but is not the initial step. Choice D, using moisture-retentive dressings and repositioning frequently, is important for prevention but not the first step in managing an existing pressure ulcer.

Correct Answer: B

Rationale: Using a bed exit alarm is the best intervention to prevent injury in a client with dementia at risk of falling. This device alerts staff when the client attempts to leave the bed, allowing for timely assistance and reducing the risk of falls. Placing the client in a room close to the nurses' station may help with supervision but does not provide immediate alerts like a bed exit alarm. Encouraging family members to stay with the client at all times may not be feasible, and raising all four side rails can lead to restraint issues and is not recommended unless necessary for the client's safety.