Correct Answer: D

Rationale: A high white blood cell count (leukocytes of 275,000/mcL) at diagnosis is associated with a worse prognosis in leukemia because it indicates a more aggressive disease with a higher tumor burden. Slow response to chemotherapy (choice A) is a consequence of the aggressive disease and not a determining factor at diagnosis. Platelets of 150,000/mcL (choice B) and leukocytes less than 10,000/mcL (choice C) are within normal ranges and not indicative of a worse prognosis in leukemia.

Correct Answer: B

Rationale: The correct answer is B: Rice cereal. Rice cereal is typically the first solid food introduced to infants because it is easy to digest and unlikely to cause an allergic reaction. Starting with rice cereal helps assess the baby's readiness for solid foods and reduces the risk of allergic responses. Choice A (Meat) is not recommended as the initial solid food due to its higher allergenic potential. Choices C (Fruits) and D (Vegetables) are also not usually recommended as the first solid food, as they may be more challenging for infants to digest compared to rice cereal.

Correct Answer: C

Rationale: For severe postoperative pain, a preventive around-the-clock schedule is necessary to prevent decreased plasma levels of medications. Providing only an opioid analgesic at this time may not be sufficient for effective pain management. Increasing the dosage without an order is unsafe and may lead to oversedation. Planning a preventive schedule of pain medication around the clock ensures consistent pain relief and better management. Giving the child a clock and explaining when they can have pain medications may increase the child's focus on waiting for relief rather than addressing the pain promptly, making it a less effective strategy.

Correct Answer: D

Rationale: Family systems theory views the family as a whole, where changes in one member affect the entire system, and changes can occur at any point within the system.

Correct Answer: A

Rationale: The Babinski reflex is the correct answer. This reflex is characterized by the fanning out of the toes when the sole of the foot is stroked. It is a normal reflex in infants and is typically present at birth, disappearing by around 12 months of age. The Moro reflex, which involves the infant's response to a sudden loss of support or a loud noise, is not related to the fanning of toes. Sucking and rooting reflexes are related to feeding behaviors and are not elicited by stroking the sole of the foot.