Final answer:
A) Musical or whistling sounds during breathing. Stridor is a type of adventitious sound that occurs during breathing, characterized by musical or whistling sounds. It may indicate a serious respiratory issue and individuals experiencing stridor should seek medical attention.
Step-by-step explanation:
Stridor is a type of adventitious sound that occurs during breathing. It is characterized by musical or whistling sounds. Stridor is often heard in conditions such as croup or a foreign object blocking the airway. It is important for individuals experiencing stridor to seek medical attention, as it may indicate a serious respiratory issue.