Correct Answer: B

Rationale: Showing the child the equipment before the procedure helps build trust and reduces fear. Using an 18-gauge needle is too large for a child, and multiple attempts can increase trauma. Restraining completely can increase fear and anxiety.

Correct Answer: D

Rationale: Edema of the lips, tongue, and pharynx is a characteristic sign of corrosive poisoning, indicating damage to mucous membranes from ingestion of a caustic substance. Other symptoms may vary depending on the poison but are not as specific to corrosive ingestion.

Correct Answer: C

Rationale: Malformed or low-set ears are often associated with congenital urinary tract anomalies, as both the ears and kidneys develop around the same time during fetal growth. Myelomeningocele, cardiovascular anomalies, and lower extremity defects are less commonly associated with UT anomalies.

Correct Answer: C

Rationale: Testicular torsion is a surgical emergency requiring immediate medical evaluation. Applying heat or elevating the legs will not alleviate the torsion, and delaying care can lead to testicular necrosis.

Correct Answer: C

Rationale: Giardia lamblia is a protozoan parasite known to cause acute diarrhea, often through contaminated water or food. Shigella, Salmonella, and E. coli are bacterial pathogens that also cause diarrhea but are not parasites.