28.Which one of the following statements is wrong?
(A) All nociceptors are myelinated.
(B) Following a cutaneous injury, enhanced pain in response to cutaneous stimuli,called hyperalgesia, develops at the site of injury (primary hyperalgesia) and in thesurrounding uninjured skin (secondary hyperalgesia).
(C) Tissue injury leads to enhanced responsiveness of nociceptors, called sensitization, whichaccounts for primary hyperalgesia.
(D) When nerves are severed, spontaneous activity and ectopic mechanical, thermal, and chemicalsensitivity develop in the injured nociceptors.