Correct Answer: B

Rationale: The correct answer is B. Hair loss from chemotherapy is usually temporary, and when it regrows, it may have a different color or texture. Sun exposure should be minimized, as the scalp may be more sensitive. Wearing hats and scarves can provide comfort and protection, but there is no preference over wearing a wig. Choice A is incorrect because hair regrowth after chemotherapy varies from person to person and usually occurs sooner than two years. Choice C is incorrect as sun exposure should be minimized to protect the sensitive scalp. Choice D is incorrect as the preference between wearing hats, scarves, or a wig is subjective and depends on the individual's comfort and preferences.

Correct Answer: C

Rationale: The correct answer is C: "I will administer this medication with meals and snacks." Pancreatic enzymes should be administered with meals and snacks to aid in the digestion of nutrients in children with cystic fibrosis. Choices A, B, and D are incorrect because administering the medication without meals and snacks may not provide the necessary support for digestion needed in cystic fibrosis.

Correct Answer: D

Rationale: The correct answer is D: Closely monitor abdominal distention. Monitoring the abdomen for signs of distention is crucial in the early detection of necrotizing enterocolitis (NEC). In NEC, the bowel wall is edematous and breaking down, leading to abdominal distention. Holding feedings is important in the management of NEC, as feedings may need to be stopped temporarily. Checking gastric residuals before feedings helps in assessing the infant's tolerance to feedings. Taking rectal temperatures is contraindicated in NEC as it can lead to the perforation of the bowel.

Correct Answer: A

Rationale: The Snellen letter chart is the most commonly used test for measuring visual acuity, particularly in school-age children and adults.

Correct Answer: C

Rationale: Osteosarcoma is typically treated with a combination of surgery and chemotherapy. This approach aims to remove the tumor and reduce the risk of metastasis. Amputation of the affected extremity may be necessary in some cases to ensure complete removal of the tumor. Intensive radiation is not the primary treatment for osteosarcoma, and bone marrow transplantation is not the standard treatment for this type of cancer.