**Core Concept**
Bezold's abscess is a type of complication that arises from a deep cervical infection, often related to mastoiditis, where the infection spreads to the neck muscles, forming a collection of pus. This condition is characterized by swelling and tenderness in the neck, typically below and behind the angle of the mandible, and can be accompanied by symptoms such as torticollis and ear discharge.

**Why the Correct Answer is Right**
The external auditory canal filled with granulation tissue is a classic sign of a chronic infection, likely mastoiditis. The swelling in the neck and torticollis are indicative of a deep cervical infection spreading to the sternocleidomastoid muscle, which is a common site for Bezold's abscess. The sternocleidomastoid muscle is located below and behind the angle of the mandible, making this location consistent with the diagnosis. The infection can spread to the neck through the mastoid tip, which is a common pathway for this type of abscess.

**Why Each Wrong Option is Incorrect**
**Option A:** Luc's abscess is a type of parotid abscess that occurs in the parotid gland, which is not consistent with the external auditory canal filled with granulation tissue and the location of the swelling in the neck.

**Option B:** Citelli's abscess is a type of parotid abscess that occurs in the superficial lobe of the parotid gland, which is not consistent with the deep cervical infection and the location of the swelling in the neck.

**Option D:** Parapharyngeal abscess is a type of deep cervical infection that occurs in the parapharyngeal space, but it typically presents with more severe symptoms such as dysphagia, dyspnea, and trismus, which are not mentioned in the case description.

**Clinical Pearl / High-Yield Fact**
Bezold's abscess is a classic example of a "deadly" complication of mastoiditis, which can be life-threatening if not promptly treated. It is essential to suspect this condition in patients with chronic ear discharge and swelling in the neck, and to promptly initiate treatment with antibiotics and surgical drainage if necessary.

**✓ Correct Answer: C. Bezold's abscess**