**Core Concept**
Tiotropium is a long-acting muscarinic antagonist (LAMA) used in the management of chronic obstructive pulmonary disease (COPD) and asthma. It works by inhibiting the action of acetylcholine on muscarinic receptors in the lungs, thereby relaxing bronchial smooth muscles and improving airflow.

**Why the Correct Answer is Right**
Tiotropium is contraindicated in patients with narrow-angle glaucoma due to its potential to worsen intraocular pressure. This is because muscarinic receptors are present in the iris sphincter muscle, and stimulation of these receptors can cause pupil constriction and increased intraocular pressure. Tiotropium's muscarinic antagonist activity can lead to unopposed alpha-adrenergic receptor stimulation, resulting in pupil dilation and increased intraocular pressure, which can be catastrophic in patients with narrow-angle glaucoma.

**Why Each Wrong Option is Incorrect**
**Option A:** Not specified. Tiotropium is not contraindicated in all unspecified conditions, so this option is too vague to be correct.
**Option B:** Hypersensitivity reactions. While tiotropium can cause hypersensitivity reactions, this is not the primary contraindication.
**Option C:** Hepatic or renal impairment. Tiotropium is primarily excreted through the lungs and does not require hepatic or renal metabolism, so it is not contraindicated in these conditions.

**Clinical Pearl / High-Yield Fact**
When prescribing LAMAs like tiotropium, it's essential to assess patients for narrow-angle glaucoma and monitor intraocular pressure regularly, especially in patients with a history of glaucoma or uveitis.

**Correct Answer:** C. Hepatic or renal impairment.