**Core Concept**
Aspergilloma, a fungal ball, can cause obstructive jaundice by invading and obstructing the bile ducts, but the most common organism causing bile duct obstruction is a parasitic one. **Ascaris lumbricoides**, a type of roundworm, is a common cause of bile duct obstruction, especially in areas with poor sanitation.

**Why the Correct Answer is Right**
Ascaris lumbricoides migrates through the biliary tree, often causing bile duct obstruction. This usually occurs when a large number of worms are present in the biliary system. **The worms can cause direct mechanical obstruction of the bile ducts**, leading to jaundice, abdominal pain, and other complications. This condition is often referred to as Ascaris-induced bile duct obstruction.

**Why Each Wrong Option is Incorrect**
**Option A:** Aspergilloma is a rare cause of bile duct obstruction and is more commonly associated with pulmonary aspergillosis.
**Option B:** Clonorchis sinensis, a type of liver fluke, can cause bile duct obstruction, but it is not as common as Ascaris lumbricoides.
**Option C:** Candida albicans is a type of fungus that can cause a variety of infections, but it is not typically associated with bile duct obstruction.

**Clinical Pearl / High-Yield Fact**
Ascaris-induced bile duct obstruction is a common cause of obstructive jaundice in areas with poor sanitation, and it is often associated with a large number of worms in the biliary system.

**Correct Answer: D. Ascaris lumbricoides**