$ Proteins, polysaccharides and nucleic acid are the macromolecules of a cell.
! DNA contains Ribose Sugar.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the question, we will analyze the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Proteins, polysaccharides, and nucleic acids are the macromolecules of a cell."
- **Explanation**: Macromolecules are large molecules formed by the polymerization of smaller units called monomers.
- **Proteins** are made up of amino acids (the monomers).
- **Polysaccharides** are carbohydrates made up of sugar monomers like glucose.
- **Nucleic acids** (like DNA and RNA) are polymers made up of nucleotide monomers.

### Step 2: Evaluate the Assertion
- The assertion is **correct** because proteins, polysaccharides, and nucleic acids are indeed the three main types of macromolecules found in cells.

### Step 3: Understand the Reason
The reason states that "DNA contains ribose sugar."
- **Explanation**: DNA, or deoxyribonucleic acid, actually contains deoxyribose sugar, not ribose sugar. The difference is that deoxyribose lacks one oxygen atom compared to ribose.

### Step 4: Evaluate the Reason
- The reason is **incorrect** because DNA contains deoxyribose sugar, not ribose sugar.

### Step 5: Conclusion
- The assertion is correct, but the reason is incorrect. Therefore, the final answer to the question is that the assertion is true, while the reason is false.

### Summary
- **Assertion**: Correct
- **Reason**: Incorrect