Correct Answer: A

Rationale: The correct answer is A. The posterior fontanel should be closed by 4 months of age. An open posterior fontanel at this age may indicate a delay in normal closure, which could be a cause for concern and require further evaluation by the healthcare provider to ensure proper development and growth.

Correct Answer: B

Rationale: Patients taking levodopa/carbidopa (Sinemet) are at increased risk for the psychiatric side effects of levodopa, including visual hallucinations, vivid dreams, nightmares, and paranoid ideation. The other questions are not directly related to problems that are likely to occur with this drug.

Correct Answer: D

Rationale: During a vaso-occlusive crisis in sickle cell anemia, maintaining bed rest is crucial to reduce oxygen consumption and alleviate pain. Movement can worsen the crisis by increasing sickling of red blood cells, leading to further tissue damage and pain. Bed rest helps to improve blood flow, reduce pain, and promote healing.

Correct Answer: C

Rationale: Grading involves adjusting the difficulty level of an activity to match the child's abilities. Bringing a toy closer for easier reach is an example of grading in therapy, helping the child succeed in reaching and grasping the toy within their current capabilities.

Correct Answer: B

Rationale: The correct action for the nurse when preparing an adolescent for a lumbar puncture is to apply a topical analgesic cream to the site one hour before the procedure. This helps reduce pain experienced during the lumbar puncture, making the procedure more comfortable for the adolescent.