Dull, aching visceral pain (such as that associated with pulpitis progressing to irreversible pain, or cardiac ischemic pain) is carried mainly by which type of nerve fiber?

Slow-conducting, unmyelinated C fibers transmit dull, throbbing, poorly localized pain (the kind seen in irreversible pulpitis or referred cardiac pain), whereas fast-conducting, myelinated A-delta fibers transmit sharp, well-localized, initial pain.