Better prognostic factor for operation of biliary duct obstruction in newborn are -a) No passage of bileb) Size of ductule > 200 micronc) Weight of baby > 3 kgd) Preterm babye) Age of 8 weeks

**Core Concept**
The question is about the prognosis of surgical intervention for biliary duct obstruction in newborns, focusing on factors that influence the outcome. **Biliary atresia** is a condition where the bile ducts are blocked, leading to liver damage. The prognosis and success of the **Kasai procedure**, a surgical intervention for this condition, depend on several factors.

**Why the Correct Answer is Right**
The correct answer is related to the factors that improve the prognosis of the Kasai procedure. A key factor is the **size of the ductule**, as larger ductules (> 200 microns) indicate a better-developed biliary system, which can lead to a more successful surgical outcome. Another important factor is the **age at surgery**, with earlier intervention (before 8 weeks) generally associated with better outcomes.

**Why Each Wrong Option is Incorrect**
**Option A:** No passage of bile is actually an indication of the severity of the obstruction, not a positive prognostic factor.
**Option C:** The weight of the baby (> 3 kg) is not directly related to the success of the surgical procedure for biliary duct obstruction.
**Option D:** Being a preterm baby does not inherently improve the prognosis for this condition.
**Option E:** An age of 8 weeks is actually a cutoff where outcomes may start to decline if surgery is delayed beyond this point.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that early diagnosis and surgical intervention are critical for improving the prognosis of biliary duct obstruction in newborns. The **Kasai procedure** is most effective when performed early, ideally before the infant is 8 weeks old.

**Correct Answer:** b) Size of ductule > 200 microns