When you touch something hot, the type of neurons that send impulses allowing you to withdraw your hand are?

The correct answer is the efferent neuron.

This is in the context of a reflex. The reflex mechanism work via the reflex arc. First, the receptor will sense the noxious stimuli which will be transmitted to the spinal cord through the afferent neuron. The neuron that connects the afferent neuron to the efferent neuron is the spinal interneuron. The efferent neuron will then send the motor impulse to the effector muscle, allowing the person to withdraw his or her limbs.