Correct Answer: B

Rationale: A sunken fontanel is a classic sign of dehydration in infants, indicating a fluid volume deficit. In dehydration, the fontanel sinks due to decreased fluid volume in the body. Increased blood pressure (Choice A) is not typically associated with dehydration in infants. Decreased pulse rate (Choice C) is not a common finding in fluid volume deficit, as the body tries to increase the heart rate to compensate for decreased volume. Low urine specific gravity (Choice D) may be seen in dehydration, but it is not as specific or as easily observable as a sunken fontanel.

Correct Answer: D

Rationale: Increased urine output is often the first sign that acute glomerulonephritis is improving, as it indicates a reduction in fluid retention and better kidney function. Stabilization of blood pressure and other symptoms typically follow.

Correct Answer: C

Rationale: In Erikson's theory of psychosocial development, school-age children typically focus on developing a sense of industry. This stage, occurring during middle childhood, involves the desire to feel competent and productive in their skills and abilities. Choices A, B, and D are incorrect because establishing trust in others (A) is related to the first stage of Erikson's theory (trust vs. mistrust) which occurs in infancy, developing a sense of autonomy (B) is linked to the second stage (autonomy vs. shame and doubt) which occurs in early childhood, and establishing a sense of identity (D) is associated with the fifth stage (identity vs. role confusion) which occurs in adolescence.

Correct Answer: C

Rationale: Vegetables, particularly pureed ones, are often recommended as a first solid food for infants because they are easy to digest and less likely to cause allergies. Fruits can be introduced later due to their natural sweetness, while eggs and meat are typically introduced after fruits and vegetables as they may pose a higher risk of allergies.

Correct Answer: C

Rationale: Vulvar irritation may indicate an infection or other issues and should be further evaluated. In a pubescent girl, breasts of slightly different sizes and irregular periods are common variations of normal development. Supernumerary nipple, an extra nipple, is a benign condition that is not typically concerning during puberty.