Question

which of the following terms means open or unblocked?
a patent
b percussion
c asphyxia
d stridor

Explanation:

A patent is a legal right, percussion refers to striking - type sounds or instruments, asphyxia is lack of oxygen due to airway blockage, and stridor is a noisy breathing sound often due to airway obstruction. None of these mean open or unblocked. There may be an error in the question as none of these options fit the description.

Answer:

None of the above options mean open or unblocked.