Several abnormal lung sounds can be helpful in understanding what condition may be affecting a patient. One such sound is wheezing. Which of the following statements about wheezing is false?
a. It indicates constriction of the lower airway passages.
b. It is typically caused by asthma.
c. It may be heard on inhalation, exhalation, or both.
d. It can be heard only with a stethoscope.
Answer: d
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