Vitamin D is synthesized by body from
(a) LDL cholesterol
(b) HDL cholesterol
(c) Triglycerides
(d) Cellulose

Options

A. LDL cholesterol
B. HDL cholesterol
C. Triglycerides
D. Cellulose

Answer

To solve the question "Vitamin D is synthesized by the body from," we need to analyze the options provided and understand the synthesis process of Vitamin D.

### Step-by-Step Solution:

1. **Understanding Vitamin D Synthesis**:
- Vitamin D is synthesized in the skin when it is exposed to sunlight, specifically UVB radiation.
- The precursor for Vitamin D synthesis in the skin is a compound derived from cholesterol.

2. **Analyzing the Options**:
- **(a) LDL cholesterol**: Low-Density Lipoprotein (LDL) is a type of cholesterol. However, it is not the direct precursor for Vitamin D.
- **(b) HDL cholesterol**: High-Density Lipoprotein (HDL) is another type of cholesterol, but it does not play a role in Vitamin D synthesis.
- **(c) Triglycerides**: These are fats and do not contribute to the synthesis of Vitamin D.
- **(d) Cellulose**: This is a polysaccharide and is not involved in Vitamin D synthesis.

3. **Identifying the Correct Precursor**:
- The actual precursor for Vitamin D synthesis is **7-dehydrocholesterol**, which is derived from cholesterol. It is important to note that while it is related to cholesterol, it is not specifically listed in the options.
- However, since the question asks which type of cholesterol is involved, the closest option would be **LDL cholesterol**, as it is a type of cholesterol from which 7-dehydrocholesterol can be derived.

4. **Conclusion**:
- Based on the analysis, the correct answer is **(a) LDL cholesterol**. Although 7-dehydrocholesterol is the direct precursor, LDL cholesterol is the type of cholesterol mentioned in the options.

### Final Answer:
**(a) LDL cholesterol**