## Core Concept
Lipoproteins are biochemical assemblies that contain both lipids and proteins. They are responsible for transporting lipids (fats) in the bloodstream. Lipoproteins vary in their composition of lipids and proteins, which determines their density and function.

## Why the Correct Answer is Right
The correct answer, which is not provided in the query, would relate to a statement about lipoproteins that is not true. Generally, lipoproteins are classified based on their density, which reflects their lipid and protein content. High-density lipoprotein (HDL) has a high protein and low lipid content, while low-density lipoprotein (LDL) has a low protein and high lipid content. Understanding the characteristics and functions of different lipoproteins is crucial for assessing cardiovascular health.

## Why Each Wrong Option is Incorrect
- **Option A:** Without the specific details of option A, it's challenging to provide a direct explanation. However, if option A states a true characteristic of lipoproteins, such as their role in lipid transport or their classification based on density, then it would be incorrect as an "except" answer.
- **Option B:** Similarly, if option B presents an accurate statement regarding lipoproteins, it would not be the correct answer to the "except" question.
- **Option C:** This option would also be incorrect if it accurately describes a feature or function of lipoproteins.
- **Option D:** If option D is the correct answer to the question, it implies that option D contains a false statement about lipoproteins.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **HDL (high-density lipoprotein)** is often referred to as "good cholesterol" because it helps remove other forms of cholesterol from the bloodstream. Conversely, **LDL (low-density lipoprotein)** is known as "bad cholesterol" because high levels can lead to plaque buildup in arteries and result in cardiovascular disease.

## Correct Answer: D.