The correct answer is Aδ fibers.

- In the dental pulp, pain sensations are transmitted by different types of nerve fibers, each with distinct characteristics.
- The Aδ fibers are myelinated nerves that conduct impulses rapidly.
- They are primarily responsible for transmitting sharp, well-localized pain sensations, which typically occur in response to mechanical or thermal stimuli affecting the tooth.
- This type of pain is often described as sudden and easily pinpointed by the patient.

- In contrast, C fibers are unmyelinated and conduct impulses more slowly.
- They transmit dull, aching, or burning pain that is poorly localized and usually is associated with inflammation or tissue injury.

- The other fibers, such as Aβ fibers, are mainly involved in transmitting touch and pressure sensations and are not typically involved in pain transmission in the dental pulp.
- B fibers are preganglionic autonomic fibers and do not play a significant role in dental pain.

Thus, the primary fibers responsible for the characteristic sharp, localized dental pain are the Aδ fibers.

Reference: Orban's Oral Histology, 14th Edition, Chapter 10: The Dental Pulp and Periapical Tissues / Page 223