Now-a-days Down syndrome Is referred to as.
**Core Concept**
Down syndrome is a genetic disorder caused by an extra copy of chromosome 21 (trisomy 21). It is characterized by intellectual disability, delayed speech, and physical growth delays. The condition is also known as Trisomy 21.
**Why the Correct Answer is Right**
The correct term for Down syndrome is Trisomy 21, as it involves an extra copy of chromosome 21. This results in an imbalance of genetic material, leading to the characteristic features of the condition. The extra genetic material disrupts the normal functioning of various genes, including those involved in brain development and function.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized term for Down syndrome.
**Option B:** This option is incorrect because it is not a valid medical term for the condition.
**Option C:** This option is incorrect because it is not a widely accepted term for Down syndrome.
**Clinical Pearl / High-Yield Fact**
It is essential to note that Down syndrome is not just a genetic disorder but also has significant clinical implications, including an increased risk of congenital heart defects, leukemia, and Alzheimer's disease.
**Correct Answer:** C. Trisomy 21.