- The cranial nerve primarily responsible for transmitting sensory information from the face is the Trigeminal nerve (Cranial Nerve V).
- This nerve is the largest cranial nerve and has both sensory and motor functions.
- Its main role, however, is to convey sensory information such as touch, pain, temperature, and proprioception from the face, scalp, and oral cavity to the brain.

The Trigeminal nerve has three major branches:
- Ophthalmic (V1): carries sensory information from the forehead, upper eyelid, and nose.
- Maxillary (V2): transmits sensory data from the lower eyelid, cheek, upper lip, and upper teeth.
- Mandibular (V3): conveys sensory information from the lower lip, lower teeth, chin, and parts of the ear, and also contains motor fibers controlling muscles of mastication.

In contrast:
- The Facial nerve (Option 1) primarily controls motor functions for facial expression and carries some taste sensations from the anterior two-thirds of the tongue but is not the main sensory nerve for facial sensation.
- The Glossopharyngeal nerve (Option 2) is involved in taste and sensory information from the posterior third of the tongue and the oropharynx.
- The Vagus nerve (Option 4) mostly manages parasympathetic control of thoracic and abdominal organs and sensory input from the larynx, pharynx, and some thoracoabdominal areas.

Therefore, the Trigeminal nerve is the key nerve transmitting sensory information from the face.

Reference: Neuroanatomy Made Easy, Volume 2, Chapter 5, Page 123