To convert kilograms to pounds, you can use the conversion factor that 1 kilogram is approximately equal to 2.20462 pounds.
So, to convert 45 kg to pounds:
\[ 45 \text{ kg} \times 2.20462 \text{ lbs/kg} \approx 99.207 \text{ lbs} \]
Rounding this to the nearest whole number, the patient weighs approximately 99 lbs.
Thus, the correct response is 99 lbs.