Correct Answer: C

Rationale: In the scientific method, a hypothesis is a tentative solution or educated guess that is tested through research. A theory (choice A) is a well-substantiated explanation based on evidence and extensive testing. A prediction (choice B) is a statement about what will happen in the future based on existing knowledge. Correlation (choice D) refers to a mutual relationship between two or more things, indicating how they may change together but not providing a solution to a problem.

Correct Answer: B

Rationale: Difficulty breathing is a common symptom of congenital heart disease in infants. Infants with congenital heart disease may experience difficulty breathing due to impaired cardiac function, which affects the heart's ability to pump blood effectively. This symptom is often due to issues like heart failure or fluid accumulation in the lungs. Excessive weight gain (Choice A) is not typically associated with congenital heart disease in infants. High blood pressure (Choice C) is less common in infants with congenital heart disease compared to adults. Increased appetite (Choice D) is not a typical symptom of congenital heart disease in infants.

Correct Answer: A

Rationale: The correct answer is to assess the response to verbal stimuli first in a child with suspected head trauma. This assessment helps in determining the child's level of consciousness and neurological status. Assessing the response to verbal stimuli allows healthcare providers to quickly evaluate if the child is alert, oriented, and able to communicate effectively. This initial assessment is crucial in identifying any immediate concerns related to the child's neurological function. Choices B, C, and D are not the primary assessments in cases of suspected head trauma. While pupillary reaction, skin color, and heart rate are important assessments in trauma situations, assessing the response to verbal stimuli takes precedence in evaluating the neurological status of a child with head trauma.

Correct Answer: B

Rationale: In sickle cell anemia, pain is primarily caused by the obstruction of blood flow by sickle-shaped cells. This obstruction leads to inadequate oxygen supply to tissues, resulting in tissue damage and pain. Choice A, inflammation of the vessels, is incorrect as it is not the primary cause of pain in sickle cell anemia. Choice C, overhydration, is unrelated to the pathophysiology of sickle cell anemia and would not lead to the characteristic pain experienced. Choice D, stress-related headaches, is also unrelated to the underlying mechanisms of pain in sickle cell anemia.

Correct Answer: B

Rationale: Correct Answer: Ensuring regular thyroid hormone replacement therapy is crucial for managing congenital hypothyroidism in children. This therapy supports normal growth and development by replacing the deficient thyroid hormones. Monitoring for signs of hyperactivity (Choice A) is not the primary management for congenital hypothyroidism; rather, the focus should be on addressing the hormone deficiency. Encouraging a high-calcium diet (Choice C) may not directly address the thyroid hormone deficiency characteristic of congenital hypothyroidism. Increasing physical exercise (Choice D) is not the mainstay treatment for this condition; hormone replacement therapy is the cornerstone of management.