**Core Concept**
Thiopentone is a barbiturate anesthetic agent used for induction of general anesthesia. Its use is contraindicated in certain conditions due to its potential risks and side effects. The absolute contraindication to thiopentone is crucial to identify to prevent adverse outcomes.

**Why the Correct Answer is Right**
The correct answer to this question is **B. Status asthmaticus**. Thiopentone can cause histamine release, leading to bronchospasm and exacerbation of respiratory conditions like status asthmaticus. This is because thiopentone triggers the release of histamine from mast cells, which can cause bronchial smooth muscle contraction, increased vascular permeability, and mucus secretion, making it a contraindication in patients with status asthmaticus.

**Why Each Wrong Option is Incorrect**
* **Option A:** Status epilepticus is not an absolute contraindication to thiopentone. In fact, thiopentone is sometimes used to control status epilepticus due to its rapid onset of action.
* **Option C:** Hypertension is not an absolute contraindication to thiopentone. While thiopentone can cause a decrease in blood pressure due to vasodilation and venodilation, it is not a contraindication in patients with hypertension.

**Clinical Pearl / High-Yield Fact**
Thiopentone can cause histamine release, leading to bronchospasm and hypotension. This is why it is essential to monitor patients closely for signs of allergic reactions and cardiovascular instability during thiopentone administration.

**Correct Answer:** **B**. Status asthmaticus.