Which part of the respiratory system has the smallest diameter?

Options :
  1. Respiratory bronchus
  2. Trachea
  3. Left primary bronchus
  4. none of the above


Answer and Explanation :-

Answer: Option 1

Explanation:

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If faith never encounters doubt, if truth never struggles with error, if good never battles evil, how can faith know its own power? In my own pilgrimage, if I had to choose between a faith that has stared doubt in the eye and made it blink, or a naive faith that has never known the firing line of doubt, I will choose the former every time.
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