Correct Answer: D

Rationale: The correct answer is D, Hemophilus influenzae type B (Hib) vaccine. Hib vaccine is crucial in preventing epiglottitis, a serious respiratory condition caused by Haemophilus influenzae type b bacteria. This vaccine is recommended for toddlers to protect them from developing epiglottitis. Choices A, B, and C are incorrect because while they are important vaccines for children, they do not specifically target the prevention of epiglottitis, unlike the Hib vaccine.

Correct Answer: C

Rationale: The correct answer is C. By age 5, children should be able to state their name and address. If a child cannot do this, it may indicate a developmental delay that requires further assessment. Choices A, B, and D do not indicate a need for further education as they reflect typical developmental milestones for preschool-age children, such as gradually improving counting skills, asking many questions, and improving speech clarity over time.

Correct Answer: C

Rationale: Ensuring the dose does not exceed 15 mg/kg is critical to avoid overdose and potential liver damage. Retaking the temperature immediately or using cold compresses is not necessary, and placing a warm blanket could exacerbate the fever.

Correct Answer: D

Rationale: Dry mucous membranes and an ill appearance are good indicators of dehydration in infants, often correlating with a fluid deficit of at least 5%. Sunken fontanels and poor skin turgor are also indicative but were not options here.

Correct Answer: D

Rationale: Both metabolic and respiratory alkalosis can cause overexcitability and nervous system stimulation due to a decrease in ionized calcium levels, which can cause symptoms such as tetany and paresthesias. Acidosis typically has the opposite effect, leading to depression of the nervous system.