Correct Answer: D

Rationale: The correct answer is D: 4-6 years of age. The CDC recommends administering the MMR booster to children aged 4 to 6 years. This booster dose is essential to ensure continued immunity against measles, mumps, and rubella. Choices A, B, and C are incorrect because they do not align with the CDC guidelines for the age range of MMR booster administration.

Correct Answer: C

Rationale: Immunization programs are the most effective way to prevent the spread of communicable diseases. Vaccinations help build immunity against specific diseases, reducing the likelihood of an outbreak. Regular health check-ups (Choice A) are important for individual health but do not directly prevent the spread of diseases on a community level. Isolation of infected individuals (Choice B) is a containment measure rather than prevention for the entire community. Public health education (Choice D) is valuable in raising awareness but may not be as effective as immunization programs in directly preventing the spread of communicable diseases.

Correct Answer: C

Rationale: Continuing the same dosage of analgesic is appropriate to manage pain effectively as death nears and the client becomes unresponsive. The primary goal of palliative care in end-of-life situations is to ensure comfort, regardless of the client's level of consciousness. Decreasing the analgesic dosage or discontinuing it could lead to inadequate pain relief, which goes against the principles of palliative care. Prescribing a less potent drug may also compromise pain management in this critical stage. Therefore, maintaining the same analgesic dosage is the most appropriate action to provide comfort and alleviate suffering.

Correct Answer: B

Rationale: The correct answer is B. Echolalia (repeating others' words) and a shuffling gait are common symptoms of Parkinson's disease. These symptoms result from the degeneration of the basal ganglia in the brain that controls movement and speech. Choice A is incorrect because non-intention tremors are not typically associated with Parkinson's disease. Choice C is incorrect as muscle spasm and a bent-over posture are not classic manifestations of Parkinson's disease. Choice D is incorrect since intention tremors and jerky movement of the elbows are not characteristic of Parkinson's disease.

Correct Answer: B

Rationale: The correct answer is B: Hepatitis B. The Hepatitis B vaccine is crucial for pregnant women as it helps prevent transmission of the virus to the baby during childbirth. Measles-mumps-rubella vaccine (choice A) is not directly related to the current situation of the client being pregnant. Human papillomavirus vaccine (choice C) is recommended for adolescents but is not specifically indicated in this case. Pneumococcal vaccine (choice D) is not a priority in this scenario compared to Hepatitis B, which is crucial for preventing vertical transmission.