**Core Concept:** Autism is a neurodevelopmental disorder characterized by significant impairments in social interaction and communication, as well as repetitive and restricted behaviors. It is a complex condition with both genetic and environmental factors contributing to its development.

**Why the Correct Answer is Right:** Option C ("Autism is mainly due to hypothalamus damage") is incorrect because the hypothalamus is a part of the brain involved in regulating various physiological functions, but it is not solely responsible for autism. Autism involves a combination of genetic, epigenetic, and environmental factors affecting brain development and function. The correct answer (A) highlights that autism is a neurodevelopmental disorder, meaning it affects the developing brain and its systems, including social and communication skills.

**Why Each Wrong Option is Incorrect:**

A. While social and communication problems are indeed a key component of autism, stating that autism is "b) Social and language communication problem" oversimplifies the condition and ignores its broader neurodevelopmental aspects.

B. "d) Metabolic disease" is incorrect because autism is not a disorder related to abnormal chemical processes or imbalances in the body. It is a neurological condition affecting brain development and function.

**Clinical Pearl:** Understanding the complex nature of autism is crucial for healthcare professionals providing care to autistic individuals. A multidisciplinary approach, involving psychiatrists, psychologists, speech therapists, and other specialists, is often necessary to address the diverse aspects of autism.

**Correct Answer:** **Autism is a) Neurodevelopmental disorder**.