Correct Answer: D

Rationale: The correct answer is D. Recall of food intake, especially amounts eaten, is often unreliable. While systematic tools like the 24-hour recall and dietary history questionnaires exist, recall can still be challenging in accurately assessing a child's dietary intake. Choices A, B, and C are incorrect because systematic assessment tools do exist, biochemical analysis is not the primary method for dietary assessment, and families' understanding of nutrition may vary but is not the main reason for the difficulty in assessing a child's dietary intake.

Correct Answer: C

Rationale: An extended family includes relatives such as grandparents, aunts, uncles, and other extended family members living together, beyond just the nuclear family unit.

Correct Answer: B

Rationale: Hydrocephalus is the most commonly associated problem with myelomeningocele, present in 80% to 90% of affected children. Biliary atresia and tracheoesophageal fistula are not typically associated with myelomeningocele. Craniostenosis refers to the premature closing of cranial sutures and is not a common issue seen with myelomeningocele.

Correct Answer: C

Rationale: Unintentional injuries are the leading cause of death among children older than 1 year in the United States.

Correct Answer: A

Rationale: Consistent parental control is crucial for effective discipline, providing clear expectations and consequences for behavior.