**Core Concept**
Macrodontia refers to the condition of having abnormally large teeth. This condition can be caused by various factors, including genetic mutations, hormonal imbalances, and certain systemic diseases.

**Why the Correct Answer is Right**
Macrodontia is often associated with cleidocranial dysplasia, a rare genetic disorder characterized by the abnormal development of bones and teeth. The condition is caused by mutations in the RUNX2 gene, which plays a crucial role in regulating bone and tooth development. Affected individuals often have large teeth, delayed eruption of teeth, and other skeletal abnormalities.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because hypodontia refers to the condition of having fewer teeth than normal, which is not related to macrodontia.
**Option B:** This option is incorrect because hyperdontia refers to the condition of having extra teeth, which is not related to macrodontia.
**Option C:** This option is incorrect because dentinogenesis imperfecta is a condition that affects the development of dentin, leading to discolored and brittle teeth, but it is not associated with macrodontia.

**Clinical Pearl / High-Yield Fact**
Cleidocranial dysplasia is a rare genetic disorder that affects about 1 in 1 million people worldwide. It is often diagnosed in childhood or adolescence, and early dental and orthodontic interventions can help manage the condition.

**Correct Answer: C. Cleidocranial dysplasia.