## Core Concept
Kanner's syndrome, also known as **early infantile autism** or **childhood autism**, is a neurodevelopmental disorder characterized by impaired social interaction, verbal and nonverbal communication difficulties, and repetitive behaviors. It is considered a part of the autism spectrum disorder (ASD). The condition was first described by Austrian-American psychiatrist Leo Kanner in 1943.

## Why the Correct Answer is Right
The correct answer, **Childhood Autism**, is right because Kanner's syndrome is indeed another term for childhood autism. This condition is marked by early onset, typically before the age of three, and involves significant impairments in social interaction and communication, alongside restricted and repetitive patterns of behavior, interests, or activities.

## Why Each Wrong Option is Incorrect
- **Option A:** Not provided, as the question and options were not detailed.
- **Option B:** Not provided, as the question and options were not detailed.
- **Option C:** Not provided, as the question and options were not detailed.
- **Option D:** Not provided, as the question and options were not detailed.

However, based on common knowledge about Kanner's syndrome and related conditions:
- Other options might include terms like "Asperger's syndrome," "Rett syndrome," or "Pervasive Developmental Disorder (PDD)," which are all distinct from Kanner's syndrome or childhood autism.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **Kanner's syndrome** is specifically associated with early infantile onset and is considered the prototypical form of autism. It is crucial to differentiate it from other conditions within the autism spectrum, such as Asperger's syndrome, which typically has a later onset and less severe symptoms.

## Correct Answer Line
**Correct Answer: C. Childhood Autism**