When you are pricked with a pin, you will draw out your hand very fast. The stimulus is

Drawing out hand

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Pricking with a pin

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Hand

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Solution

The correct option is B Pricking with a pin
A stimulus is something that causes a physiological response. The ability of an organism or organ to respond to external stimuli is called sensitivity. So, in the above example, the stimulus is pricking with pin and not drawing out hand, only pin or hand.
Therefore, the correct answer is option B.

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