Tamara broke her right tibia and has undergone two separate…

Tamara broke her right tibia and has undergone two separate surgeries. Although the bone has healed, she suffers from increasing pain around the incision sites.  She reads an article about pain.  The article suggests that Tamara’s pain may be due to the lack of the usual inhibition of transmission of pain signals through Tamara’s spinal cord.  Which of these statements best describes how a postsynaptic neuron is inhibited by a  presynaptic neuron?