Which of the following is not a target molecule for drug function in body ?

Options

A. Carbohydrates
B. Lipids
C. Vitamins
D. Proteins

Explanation

To determine which of the following is not a target molecule for drug function in the body, we need to analyze each option provided:

1. **Carbohydrates**: These are biomolecules that can interact with drugs. For example, certain drugs may target carbohydrate structures on cell surfaces to exert their effects.

2. **Lipids**: Similar to carbohydrates, lipids are also target molecules for many drugs. Drugs can interact with lipid membranes or lipid-based signaling molecules.

3. **Vitamins**: While vitamins are essential nutrients that the body needs for various functions, they do not typically act as direct targets for drug action. Instead, they may be involved in metabolic pathways but do not interact with drugs in the same way that carbohydrates, lipids, and proteins do.

4. **Proteins**: Proteins are one of the primary targets for drug action. Many drugs work by binding to specific proteins, such as enzymes or receptors, to modify their activity.

Based on this analysis, the correct answer is:

**C. Vitamins**

### Step-by-Step Solution:
1. **Identify the options**: List the molecules given in the question - carbohydrates, lipids, vitamins, and proteins.
2. **Understand drug targets**: Define what a drug target is - a biomolecule that interacts with a drug to produce a therapeutic effect.
3. **Analyze each option**:
- Carbohydrates: Interact with drugs.
- Lipids: Interact with drugs.
- Vitamins: Do not typically interact with drugs as a target.
- Proteins: Interact with drugs.
4. **Conclude**: Since vitamins do not serve as drug targets, the answer is C. Vitamins.