The nurse explains that the medication Prostaglandin E1 is being given to their child with transposition of the great vessels to:

A.Altered level of consciousness and thready pulse.

In a child after heart surgery to correct Tetralogy of Fallot (TOF), a thready pulse and altered level of consciousness can be indicative of poor cardiac output. This may suggest that the heart is not effectively pumping blood to meet the body's needs.

B. Bounding pulses and mottled skin: Bounding pulses and mottled skin are not typical signs of decreased cardiac output. Bounding pulses are often associated with increased cardiac output.

C. Capillary refill of 2 seconds and blood pressure of 96/47 mmHg: A capillary refill of 2 seconds is within the normal range, and a blood pressure of 96/47 mmHg is reasonable for a child. These findings do not necessarily indicate poor cardiac output.

D. Extremities warm to the touch and pale skin: Warm extremities and pale skin are not typical signs of decreased cardiac output. Cold extremities and cyanosis may be more concerning signs.

A white glow of the pupil, often referred to as "cat's eye reflex" or "leukocoria," is a significant and characteristic sign of retinoblastoma. It occurs when the tumor within the eye reflects light, resulting in a white or yellowish glow in the pupil when light is shined into it. This can be seen in flash photographs or in certain lighting conditions. It's a crucial sign that may indicate the presence of retinoblastoma, a rare eye cancer that primarily affects young children.

The other options, B (ptosis of the eye), C (fixed and dilated pupil), and D (purulent eye discharge), are not typically associated with retinoblastoma. Ptosis is the drooping of the upper eyelid, a fixed and dilated pupil is usually a sign of neurological issues, and purulent eye discharge is often associated with eye infections rather than retinoblastoma.