Correct Answer: C

Rationale: The correct answer is C, Thelarche. Thelarche refers to the onset of breast development, which is typically the first sign of puberty in girls. This occurs before menarche (the first menstrual period). Choices A and B, acne and hair growth in the pubic area and underarms, are not the first signs of puberty in girls. While acne can be a common occurrence during puberty, it usually appears after other physical changes. Hair growth in the pubic area and underarms also occurs later in the puberty process.

Correct Answer: D

Rationale: The correct answer is D because screaming and thrashing his arms and legs are indicative behaviors of discomfort or pain in young children. The child's actions suggest a higher likelihood of experiencing postoperative pain and necessitate further evaluation. Choices A, B, and C do not exhibit overt signs of distress or discomfort associated with pain, making them less likely candidates for postoperative pain assessment.

Correct Answer: B

Rationale: Correct Answer: B. Increased swallowing can indicate bleeding at the surgical site, which is a potential complication after tonsillectomy. Choice A, Arrhythmias, are not typically associated with tonsillectomy. Choice C, Increased blood sugar, is not a common clinical manifestation after a tonsillectomy. Choice D, Increased urinary output, is not a typical clinical manifestation to observe for in the postoperative period after a tonsillectomy.

Correct Answer: A

Rationale: In the case of severe isotonic dehydration, the initial fluid of choice is 0.9% normal saline. This solution is preferred because it helps to restore both fluids and electrolytes effectively. Options B, C, and D are not suitable for the initial management of severe isotonic dehydration. D5 0.2% (1/4) normal saline (Choice B) is a hypotonic solution and might worsen the imbalance. D5W (Choice C) is a hypotonic solution that does not contain electrolytes essential for rehydration. Albumin (Choice D) is a colloid solution used for specific indications like hypoproteinemia or hypoalbuminemia, not for initial rehydration in severe dehydration.

Correct Answer: C

Rationale: The correct response is to let the parents know they are allowed to stay with the child. Allowing parents to stay with the child can help reduce the child's anxiety and provide comfort. Choice A is incorrect as the parents should be encouraged to stay with their child. Choice B is not the immediate response the nurse should provide. Choice D is inappropriate as it does not address the benefits and importance of parental presence for the child's well-being during hospitalization.