**Core Concept**
Polycythemia in neonates can lead to clinical symptoms such as intolerance to feed and abdominal distension due to increased blood viscosity and potential hyperviscosity syndrome.

**Why the Correct Answer is Right**
In this case, the neonate has a high packed cell volume (PCV) of 72%, indicating polycythemia. Polycythemia can cause hyperviscosity syndrome, leading to symptoms like intolerance to feed and abdominal distension. Partial exchange transfusion is the best management option to reduce the hematocrit level and alleviate symptoms. This procedure involves replacing a portion of the neonate's blood with a crystalloid solution to decrease the viscosity of the blood and alleviate symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Hydration with IV Fluids may help in some cases of hyperviscosity syndrome but is not the best management option for polycythemia. It does not address the underlying issue of high hematocrit levels.
**Option C:** Presumptive treatment for sepsis is not indicated in this case as the sepsis screen is negative. The symptoms are not consistent with sepsis.
**Option D:** Medical Management for intestinal obstruction is not indicated as the physical examination is unremarkable and there is no evidence of intestinal obstruction.

**Clinical Pearl / High-Yield Fact**
In neonates with polycythemia, partial exchange transfusion is the preferred management option to reduce the risk of hyperviscosity syndrome complications.

**✓ Correct Answer: B. Partial Exchange Transfusion**