Laryngitis is most commonly caused by which type of agents?

Laryngitis is most commonly caused by viral agents. This condition often arises following a viral upper respiratory infection, such as the common cold or influenza. Viral laryngitis typically manifests with symptoms like hoarseness, sore throat, and sometimes cough. Common viral pathogens responsible for laryngitis include rhinoviruses, adenoviruses, and other respiratory viruses.

Bacterial causes of laryngitis exist but are less frequent; they can lead to more severe conditions such as bacterial laryngitis and epiglottitis. Fungal infections are rare and usually occur in immunocompromised individuals. Parasitic infections are not typically associated with laryngitis. Thus, viral agents are the predominant cause, making "viral" the correct answer.