Cobalt is present in which vitamin?
**Core Concept**
The question tests knowledge of the chemical composition of essential vitamins, specifically focusing on the presence of **cobalt**. Cobalt is a key component of a crucial vitamin, necessary for various bodily functions. This understanding is fundamental in **biochemistry** and **nutrition**.
**Why the Correct Answer is Right**
Cobalt is a critical component of **Vitamin B12**, also known as cobalamin. Vitamin B12 plays a vital role in the synthesis of **DNA**, **fatty acid**, and **energy production**. It is essential for the proper functioning of the **nervous system** and the formation of **red blood cells**.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not contain cobalt.
**Option B:** Incorrect as it is not associated with cobalt.
**Option C:** Incorrect because it is not the vitamin that contains cobalt.
**Clinical Pearl / High-Yield Fact**
Vitamin B12 deficiency can lead to **anemia** and **neurological disorders**, making it crucial for diagnosis and treatment.
**Correct Answer:** D. Vitamin B12.