**Core Concept**
Postoperative jaundice, also known as postoperative cholestasis, is a condition where elevated liver enzymes and bilirubin levels occur after surgery. This is often due to the release of bile duct constricting substances or physical compression of the bile ducts during surgical procedures.

**Why the Correct Answer is Right**
The correct answer is related to the use of **suxamethonium** (succinylcholine) during anesthesia. Suxamethonium is a depolarizing muscle relaxant that acts on nicotinic acetylcholine receptors at the neuromuscular junction. However, it also causes a release of histamine, which can lead to vasodilation, increased vascular permeability, and subsequent compression of the bile ducts. This compression can impede bile flow, resulting in postoperative jaundice.

**Why Each Wrong Option is Incorrect**
**Option A:** **Halothane** is an inhalational anesthetic that can cause hepatotoxicity, but it is not the primary cause of postoperative jaundice.
**Option B:** **Morphine** is an opioid analgesic that can cause cholestasis, but it is not the most common cause of postoperative jaundice.
**Option C:** **Gallstones** are a common cause of jaundice, but they are not typically associated with postoperative jaundice.

**Clinical Pearl / High-Yield Fact**
Remember the mnemonic "SUX" to associate suxamethonium with the risk of postoperative jaundice.

**Correct Answer:** C.