**Core Concept**
Physiological jaundice, also known as neonatal jaundice, is a benign condition characterized by a temporary elevation of bilirubin levels in newborns. It occurs due to the immaturity of the liver and the breakdown of red blood cells, leading to an accumulation of bilirubin in the blood and tissues.

**Why the Correct Answer is Right**
Physiological jaundice typically presents in the first week of life, peaking around 3-5 days post-birth. The bilirubin levels gradually decrease as the liver matures and becomes more efficient in processing and excreting bilirubin. This process is influenced by the breakdown of red blood cells, which is higher in newborns due to the transition from fetal to adult hemoglobin.

**Why Each Wrong Option is Incorrect**
**Option A:** This age is too early for physiological jaundice to be seen, as bilirubin levels are typically elevated within the first week of life.
**Option B:** This age is too late for physiological jaundice, as it usually resolves by the end of the first week.
**Option C:** This age is not specific to physiological jaundice, as it can occur in various conditions such as hemolytic disease of the newborn or biliary atresia.

**Clinical Pearl / High-Yield Fact**
Physiological jaundice is a self-limiting condition that resolves on its own within the first week of life. It's essential to differentiate it from pathologic jaundice, which requires further investigation and treatment.

**Correct Answer: C. 7-14 days**