**Core Concept**
Neonatal jaundice, a common condition in newborns, occurs due to an increased level of bilirubin in the blood. Bilirubin is a byproduct of the breakdown of red blood cells, which is normally processed by the liver. However, in newborns, the liver may not be mature enough to efficiently remove bilirubin, leading to its accumulation.

**Why the Correct Answer is Right**
In neonatal jaundice, the bilirubin level is typically elevated, with a normal range being less than 5 mg/dL. However, in this case, the bilirubin level is expected to be higher, likely in the range of 15-20 mg/dL. This increased level is due to the immaturity of the newborn's liver, which is unable to effectively conjugate bilirubin for excretion.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because bilirubin levels below 5 mg/dL are typically within the normal range for newborns.
**Option B:** This option is incorrect because bilirubin levels in the range of 5-10 mg/dL may be considered mildly elevated, but not typically indicative of neonatal jaundice.
**Option C:** This option is incorrect because bilirubin levels above 20 mg/dL are typically associated with more severe forms of jaundice, such as hemolytic disease or biliary atresia.

**Clinical Pearl / High-Yield Fact**
Neonatal jaundice typically peaks between 3-5 days of life and resolves by 7-10 days. It is essential to monitor bilirubin levels closely in newborns, especially those with risk factors for jaundice, to prevent kernicterus and other complications.

**Correct Answer: C. 20 mg/dL**