Which of the following is a valid contraindication to the administration of an unspecified vaccine to a 2-year-old child?

Correct Answer: C

Rationale: Anaphylaxis to a prior vaccine dose (Choice C) is a valid contraindication due to the risk of recurrence. Choice A (mild illness) is not a contraindication per CDC—vaccines can be given. Choices B and D (family circumstances) don’t affect the child’s eligibility unless the child is immunosuppressed.

Correct Answer: B

Rationale: Preschoolers (3-5 years) are in Erikson’s Initiative vs. Guilt stage, exploring purpose. Trust vs. Mistrust (infancy), Identity vs. Role Confusion (adolescence), and Industry vs. Inferiority (school-age) don’t apply.

Correct Answer: B

Rationale: Poisoning is listed as the leading cause under 1 year in the document, though falls are more common per CDC (<1 year data). Assuming context (e.g., post-infancy), Choice B aligns with the answer provided.

Correct Answer: B

Rationale: Difficulty concentrating is a hallmark of ADHD (DSM-5). Other choices are unrelated symptoms.

Correct Answer: A

Rationale: Placing the syringe between cheek and gums prevents choking and ensures slow administration (AAP), unlike other less safe methods.