**Core Concept**
Ludwig's angina is a severe infection of the submandibular space, often involving multiple bacterial pathogens. The incision for drainage in Ludwig's angina is critical to relieve the pressure and restore airway patency. The location of the incision is crucial in preventing further complications.

**Why the Correct Answer is Right**
The incision for drainage in Ludwig's angina typically extends from the midline of the neck, anterior to the platysma, to the angle of the mandible, and then posteriorly to the angle of the mandible, following the fascial planes. This approach helps to minimize the risk of injury to the marginal mandibular branch of the facial nerve. The incision also allows for the evacuation of pus and the restoration of normal anatomical relationships.

*Option A:* A vertical incision from the chin to the angle of the mandible is incorrect because it may not adequately address the extent of the infection and may lead to further complications such as facial nerve injury.
*Option B:* A horizontal incision across the neck is incorrect because it may not follow the fascial planes and may not allow for adequate drainage of the infected submandibular space.
*Option C:* An incision that does not extend to the angle of the mandible is incorrect because it may not provide adequate access to the infected area and may lead to incomplete drainage.

**Clinical Pearl / High-Yield Fact**
In cases of Ludwig's angina, it is essential to establish airway patency and secure the patient's airway before performing the incision for drainage. This may involve intubation or tracheostomy in some cases.

**Correct Answer:** C.