All of these things can block a bronchus and cause collapse of a lung EXCEPT ________
A) stridor
B) mucus
C) a tumor
D) a foreign body
A
Explanation: A) Correct! Stridor is an abnormal breath sound, not the obstruction.
B) Mucus can cause collapse of a lung.
C) A tumor can cause collapse of a lung.
D) A foreign body can cause collapse of a lung.
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