Match the respiratory condition with its hallmark symptom.

Choice A rationale Viral croup (laryngotracheobronchitis) is characterized by inflammation and edema of the larynx and subglottic trachea. This narrowing causes the distinctive, turbulent airflow sound of inspiratory stridor and the barking, seal-like cough due to vocal cord irritation, making this an accurate match. Choice B rationale Asthma is a chronic inflammatory disorder of the airways leading to hyperresponsiveness, reversible airflow obstruction, and bronchoconstriction. The turbulent airflow through multiple narrowed small airways generates the characteristic polyphonic (musical) expiratory wheezing and the accompanying sensation of chest tightness, reflecting increased airway resistance. Choice C rationale Epiglottitis is a bacterial infection causing rapid and severe inflammation of the epiglottis. The swollen, cherry-red epiglottis mechanically obstructs the airway and makes swallowing extremely painful, leading to the classic triad of drooling, dysphagia (difficulty swallowing), and a muffled or "hot potato" voice. Choice D rationale Bronchiolitis, often caused by Respiratory Syncytial Virus (RSV), involves inflammation and necrosis of the small airways (bronchioles). This process causes narrowing and mucus production, resulting in wheezing from turbulent airflow and crackles (rales) from the "popping" open of fluid-filled or collapsed alveoli and bronchioles during inspiration.