**Core Concept**
Multifactorial inheritance refers to a mode of inheritance where a complex trait or disorder is influenced by multiple genetic and environmental factors. This type of inheritance does not follow a simple Mendelian pattern, such as autosomal dominant or recessive, and is often seen in conditions like congenital heart defects, cleft lip and palate, and certain types of cancer.

**Why the Correct Answer is Right**
In multifactorial inheritance, the risk of developing the condition increases with the presence of multiple risk factors, including genetic and environmental influences. This can be seen in conditions like neural tube defects, where both genetic and environmental factors contribute to the risk. For example, a genetic predisposition to folate metabolism defects can be combined with environmental factors such as maternal nutritional deficiencies to increase the risk of neural tube defects.

**Why Each Wrong Option is Incorrect**
**Option A:** Autosomal dominant inheritance is a simple Mendelian pattern of inheritance where a single copy of the dominant allele is enough to cause the condition. This is not multifactorial.
**Option B:** X-linked inheritance is a pattern of inheritance where the gene responsible for the condition is located on the X chromosome. This is not multifactorial.
**Option C:** Mitochondrial inheritance is a pattern of inheritance where the gene responsible for the condition is located in the mitochondria. This is not multifactorial.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that multifactorial inheritance often involves a combination of genetic and environmental factors, and a thorough understanding of these factors is crucial for accurate diagnosis and management.

**Correct Answer: D. Multifactorial inheritance is seen in various conditions like congenital heart defects, cleft lip and palate, and certain types of cancer.**