Which of the following is a whistling sound heard during auscultation of the chest?

Rhonchi is characterized by a whistling or snoring sound that can be heard during auscultation of the chest, particularly during expiration. This sound is typically caused by the turbulent airflow through thickened bronchial walls or mucus obstructing the airways, often associated with conditions like bronchitis or other forms of airway obstruction.

In contrast, rales (also known as crackles) represent fine or coarse crackling sounds often heard during inhalation, indicating fluid in the alveoli or collapsed alveoli. Stridor is a high-pitched, wheezing sound usually associated with airway obstruction in the trachea or larynx and is most often heard during inspiration. Apnea refers to a temporary cessation of breathing, which is not characterized by any sound detectable through auscultation. Understanding these distinctions helps in identifying specific respiratory conditions based on the auscultation findings.