Correct Answer: C

Rationale: Aortic stenosis is a condition characterized by the narrowing of the aortic valve, leading to reduced blood flow from the heart to the body. This narrowing restricts the amount of oxygenated blood that can reach various tissues, including muscles. As a result, individuals with aortic stenosis may experience exercise intolerance, as their muscles may not receive an adequate oxygen supply during physical activity. This can manifest as fatigue, shortness of breath, and overall decreased exercise capacity. Pallor (choice A) is a pale appearance that may be seen in anemia or other conditions affecting blood flow but is not specific to aortic stenosis. Hyperactivity (choice B) and gastrointestinal disturbances (choice D) are not typically associated with aortic stenosis.

Correct Answer: C

Rationale: The correct answer is C, Measles. Measles commonly presents with symptoms such as fever, sore mouth, and red eyes. These characteristic symptoms help differentiate measles from the other conditions listed. Tuberculosis (Choice A) typically presents with respiratory symptoms, Meningitis (Choice B) commonly presents with symptoms like headache, neck stiffness, and altered mental status, while Pertussis (Choice D) is characterized by severe coughing spells. Therefore, in this case, the symptoms described align more closely with measles.

Correct Answer: D

Rationale: In diabetic ketoacidosis (DKA), there is a state of dehydration and electrolyte imbalance. Normal saline is the initial fluid of choice to help restore intravascular volume and improve electrolyte balance. It also helps to correct acidosis. Potassium chloride IV infusion is commonly added to the treatment regimen once kidney function is confirmed to prevent hypokalemia. Dextrose 5% IV infusion is not the first-line treatment for DKA as it can worsen hyperglycemia. Ringer's Lactate is not typically used as the initial fluid for managing DKA as it contains potassium and could worsen hyperkalemia.

Correct Answer: D

Rationale: When preparing a sibling to see their brother in the pediatric intensive care unit after a near-drowning accident, it is essential to cover tubes and wires with a sheet, wash off any existing blood, and explain what the sibling will see. This approach helps the sibling understand the situation better and prepares them emotionally for the encounter, reducing potential distress and trauma. By providing information and visual preparation, the sibling can have a more controlled and less overwhelming experience when visiting their brother in the intensive care unit. Choice A is incorrect as informing the child that this could be the last time he sees his sibling may cause unnecessary distress and anxiety. Choice B is incorrect as it dismisses the sibling's emotional response, which is essential to address in a supportive manner. Choice C is incorrect as honesty and appropriate information sharing are crucial, even in difficult situations, to help the child cope effectively with the circumstances.

Correct Answer: A

Rationale: To calculate the safest dose of amoxicillin for Atta, we multiply the weight (20kg) by the daily dose (50 mg/kg/day) which equals 1000 mg/day. Since the dose is to be given in two divided doses, the safest dose for each administration would be 500 mg. Therefore, the correct answer is 1000 mg, as it aligns with the prescribed dose for this child based on weight and dosing guidelines. Choice B, 750 mg, is incorrect as it does not match the calculated daily dose. Choice C, 500 mg, is incorrect as it represents the safest dose for each administration, not the total daily dose. Choice D, 250 mg, is incorrect as it is below the calculated daily dose required for the child.