When you stub your toe on a hard object, the lingering ache you feel after the initial sharp pain has worn off is caused by
a. pain messages traveling in Ad fibers.
b. input reaching the somatosensory cortex and being processed in adjacent areas.
c. information being carried in slowly conducting unmyelinated fibers.
d. rapid adaptation occuring at spinal cord levels.
e. stimulation of the secondary sensory pain system.