**Core Concept**
Redistribution phenomenon refers to the movement of a drug from the bloodstream into various tissues, leading to a transient decrease in blood concentration and a delayed onset of action. This is particularly relevant in volatile anesthetics and barbiturates, where the drug’s solubility in lipid-rich tissues influences its pharmacokinetics.

**Why the Correct Answer is Right**
Thiopentone (a barbiturate) is highly lipid-soluble and readily distributes into fatty tissues. After administration, it rapidly enters adipose and other lipid-rich tissues, causing a temporary drop in plasma concentration. This redistribution results in a delayed onset of action and prolonged duration, a hallmark of barbiturates. The phenomenon is more pronounced in thiopentone due to its high lipid solubility and extensive tissue binding.

**Why Each Wrong Option is Incorrect**
Option A: Halothane is a volatile anesthetic with rapid onset and minimal redistribution; it primarily acts in the central nervous system and does not show significant redistribution.
Option B: Ether, though volatile, has a short duration and is metabolized rapidly; it does not exhibit notable redistribution like thiopentone.
Option D: "All" is incorrect because only thiopentone demonstrates significant redistribution; halothane and ether do not.

**Clinical Pearl / High-Yield Fact**
Barbiturates like thiopentone are known for redistribution, which causes delayed onset and prolonged effects—this is why they are less favored in modern anesthesia due to risk of prolonged sedation and respiratory depression.

✓ Correct Answer: C. Thiopentone