## Core Concept
The question tests the understanding of pharmacokinetics and pharmacodynamics of various drugs, specifically their routes of administration. Inhalation is a common route for drugs that act locally in the lungs or are intended for systemic effects with rapid onset. The solubility and chemical properties of a drug determine its suitability for inhalation.

## Why the Correct Answer is Right
Propranolol is a non-selective beta-blocker. Beta-blockers are generally administered orally or intravenously because they are not lipophilic enough to be effectively absorbed through the lung tissue when administered via inhalation, nor is there a therapeutic rationale for their inhaled administration for most indications. In contrast, drugs like salbutamol (albuterol) and formoterol are inhaled for their local effects on the lungs as bronchodilators in asthma and COPD. Similarly, inhaled corticosteroids like fluticasone are used for their local anti-inflammatory effects in the lungs.

## Why Each Wrong Option is Incorrect
* **Option A:** Salbutamol (albuterol) can be administered by inhalation and is commonly used for quick relief of asthma symptoms and COPD.
* **Option B:** Formoterol can also be administered by inhalation and is used for the control of asthma symptoms and COPD.
* **Option D:** Fluticasone is administered by inhalation for its local effects as a corticosteroid in managing asthma and COPD.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the route of administration of a drug is determined by its intended effect, solubility, and the presence of suitable receptors or sites of action. For respiratory conditions, inhalation can provide targeted therapy with reduced systemic side effects.

**Correct Answer: . Propranolol**