Which is a sound due to obstruction in the trachea or larynx?

The correct answer is Stridor.

Stridor is a high-pitched, musical sound that is caused by obstruction of the trachea or larynx. It is often a sign of a medical emergency and can be caused by a variety of conditions, including:

- Croup

- Diphtheria

- Epiglottitis

- Foreign body aspiration

- Laryngitis

- Tracheal stenosis

Stridor is usually accompanied by difficulty breathing and may be associated with other symptoms, such as coughing, wheezing, and hoarseness. If you or someone you know is experiencing stridor, it is important to seek medical attention immediately.