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Hiccups can be best described as 

(a) forceful sudden expiration. 

(b) forceful contraction of intercostal muscles during deep breathing. 

(c) vibration of the soft palate during breathing while sleeping. 

(d) jerky incomplete inspiration.

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The correct option is (d) jerky incomplete inspiration.

Explanation:

A hiccup can be described as a jerky incomplete inspiration. It is an involuntary contraction of the diaphragm that may repeat several times per minute. In medical terms, it is known as synchronous diaphragmatic flutter (SDF).

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