**Core Concept**
Enterohepatic circulation is a process where a substance is excreted into the bile, stored in the gallbladder, and then reabsorbed from the intestine back into the bloodstream. This process can affect the duration of action and pharmacokinetics of certain drugs.

**Why the Correct Answer is Right**
Aspirin (acetylsalicylic acid, ASA) undergoes enterohepatic circulation. After oral administration, ASA is metabolized to salicylic acid, which is then conjugated to form salicyluric acid. Salicyluric acid is excreted into the bile and stored in the gallbladder. Some of this conjugate is reabsorbed from the intestine back into the bloodstream, effectively prolonging the duration of action of ASA.

**Why Each Wrong Option is Incorrect**
**Option A:** Ibuprofen does not undergo enterohepatic circulation. It is primarily excreted unchanged in the urine through the kidneys.
**Option B:** Naproxen does not undergo enterohepatic circulation. It is metabolized by the liver and excreted in the urine.
**Option C:** Indomethacin does not undergo enterohepatic circulation. It is primarily metabolized by the liver and excreted in the urine.

**Clinical Pearl / High-Yield Fact**
Aspirin's unique enterohepatic circulation contributes to its long duration of action and potential for accumulation to toxic levels in patients with impaired liver or kidney function.

**Correct Answer: A. Aspirin**