Correct Answer: A

Rationale: The FLACC scale is a validated pain assessment tool suitable for infants and young children, including 3-month-olds. It assesses pain based on five categories: Face, Legs, Activity, Cry, and Consolability. Since infants cannot communicate their pain verbally, the FLACC scale is effective in evaluating pain by observing these behavioral indicators. The other options, such as the Poker chip tool, Number scale, and Visual analog scale, are not specifically designed for infants and may not provide accurate pain assessment in this age group.

Correct Answer: C

Rationale: The most appropriate technique to use when explaining a central line dressing change to a preschool-age client is to let the child perform a dressing change on a doll. Preschool-age children learn best through play and hands-on activities. Allowing the child to practice on a doll helps them understand the procedure in a non-threatening and interactive way. This technique can reduce anxiety, increase cooperation, and enhance the child's understanding of the dressing change process. Choices A and B do not provide a hands-on approach, which is crucial for preschool-age children. Choice D is incorrect as providing an interactive experience is more effective than just showing pictures or giving verbal instructions.

Correct Answer: B

Rationale: The priority nursing diagnosis for a child diagnosed with an ear infection and experiencing nighttime awakenings and crying would be 'Pain related to ear infection.' Pain management is crucial to ensure the child's comfort and well-being, which can also impact their sleep patterns. Addressing the pain as a priority can lead to improved sleep and overall recovery for the child.

Correct Answer: C

Rationale: Typhoid fever is primarily spread through contaminated food and water, usually due to poor sanitation practices. The bacteria responsible for typhoid fever, Salmonella Typhi, is typically found in food or water contaminated by the feces of an infected person. Contaminated air is not a significant mode of transmission for typhoid fever, making choice A incorrect. While waterborne transmission can occur, it is through contaminated water rather than specifically mineral water, making choice B incorrect. Therefore, the correct answer is C, as contaminated food and water are the main sources of transmission for typhoid fever.

Correct Answer: A

Rationale: In this scenario, the priority is to assess the child's vital signs first, including heart rate, respiratory rate, and blood pressure. These data will provide critical information on the child's current physiological status and guide further interventions. Option B, recent exposure to communicable diseases, is not the priority in an acute ingestion situation. Option C, number of immunizations received, and option D, height and weight, are important but not as critical as assessing vital signs in this immediate situation.