Which of the following is the largest nerve?
(a)Vagus
(b)Olfactory
(c)Hypoglossal
(d)Glossopharyngeal

Hint: After leaving the medulla between the olive and accordingly the sub-par cerebellar peduncle, the vagus reaches out through the jugular foramen, at that point passes into the carotid sheath between the interior arteria carotis and therefore the internal vena jugularis right down to the neck, chest, and abdomen, where it contributes to the innervation of the viscera, reaching all the thanks to the colon. Other than giving some yield to fluctuated organs, the vagus contains somewhere in the range of 80%, and 90% of afferent nerves generally passing on tangible data about the state of the body's organs to the focal sensory system.

Complete answer
The vagus verifiably referred to on the grounds that the vagus is the 10th nerve or CN X, and interfaces with the parasympathetic control of the alimentary canal, guts, and lungs. The vagus nerves are normally mentioned within the singular. It is the longest nerve of the autonomic systema nervosum within the physical body and comprises sensory and motor fibers. The tangible filaments begin from neurons of the nodose ganglion, while the engine strands originate from neurons of the dorsal engine core of the vagus and the core vaguely.

Additional information
The right and left vagus nerves plunge from the cranial vault through the jugular foramina, infiltrating the carotid sheath between the inside and outer carotid supply route courses, at that point passing posterolateral to the normal carotid corridor. The cell assemblages of instinctive afferent filaments of the vagus are found reciprocally inside the mediocre ganglion of the vagus (nodose ganglia).
The right vagus offers access to the best possible repetitive laryngeal nerve, which snares around the correct arteria subclavia and climbs into the neck between the windpipe and thus the throat.

So the correct answer is ‘Vagus’.

Note: The correct vagus at that point crosses front to the privileged subclavian vein, runs back to the unrivaled vena cava, slips back to the correct fundamental bronchus, and adds to heart, mnemonic, and esophageal plexuses. It shapes the back vagal trunk at the lower part of the throat and enters the stomach through the esophageal break.