The correct answer is Monosynaptic reflex.

- A reflex arc is the neural pathway that mediates a reflex action. Reflex arcs can be classified based on the number of synapses involved between the sensory input and the motor output neurons.

- In a monosynaptic reflex, there is only one synapse between a sensory neuron and a motor neuron. This allows for a very rapid response because the signal does not have to pass through any interneurons. A classic example of this is the patellar (knee-jerk) reflex.

- In contrast, a polysynaptic reflex involves multiple synapses and usually includes one or more interneurons between the sensory and motor neurons. These reflexes are generally more complex and slower but allow for greater coordination, such as the withdrawal reflex.

- Intersegmental reflexes involve communication across multiple spinal cord segments and are typically polysynaptic.

- The withdrawal reflex is an example of a polysynaptic reflex where multiple interneurons mediate the response to a painful stimulus.

Reference: Guyton and Hall Textbook of Medical Physiology, 14th Edition, Chapter 7: Reflex Activity of the Spinal Cord