**Core Concept**
The general visceral efferent (GVE) column is a part of the autonomic nervous system that controls involuntary functions of the viscera, such as digestion, blood pressure, and heart rate. It is responsible for the efferent (outgoing) control of the viscera, including the smooth muscles, glands, and blood vessels.

**Why the Correct Answer is Right**
The correct answer is the nucleus ambiguus, which is a group of neurons located in the medulla oblongata. The nucleus ambiguus is responsible for controlling the parasympathetic (inhibitory) innervation of the smooth muscles and glands in the viscera, such as the heart, lungs, and digestive tract. The parasympathetic fibers from the nucleus ambiguus are part of the general visceral efferent column, which helps to regulate the autonomic functions of the body.

**Why Each Wrong Option is Incorrect**
* **Option A:** The dorsal motor nucleus of the vagus nerve is also a source of parasympathetic fibers, but it is part of the special visceral efferent column, which controls the muscles of the pharynx and larynx.
* **Option B:** The lateral horn of the spinal cord contains the sympathetic preganglionic neurons, which are part of the general visceral efferent column, but they are responsible for the sympathetic (excitatory) innervation of the viscera, not the parasympathetic innervation.
* **Option D:** The hypoglossal nucleus controls the muscles of the tongue and is not related to the general visceral efferent column.

**Clinical Pearl / High-Yield Fact**
The GVE column is responsible for the parasympathetic control of the heart, and damage to the nucleus ambiguus can lead to Horner's syndrome, which is characterized by miosis (pupil constriction), ptosis (drooping eyelid), and anhidrosis (lack of sweating).

**Correct Answer: C. Nucleus ambiguus.**