## **Core Concept**
The question tests knowledge of the fatty acid composition of various oils and fats, specifically focusing on the percentage of polyunsaturated fatty acids (PUFAs). PUFAs are a type of unsaturated fatty acid that cannot be synthesized by the human body and are essential for various physiological functions. They are characterized by the presence of multiple double bonds in their carbon chain.

## **Why the Correct Answer is Right**
Among the given options, **C. Linseed oil (or Flaxseed oil)** stands out for its exceptionally high content of polyunsaturated fatty acids, particularly alpha-linolenic acid (ALA), a type of omega-3 fatty acid. Linseed oil is known to contain approximately 50-60% of its fatty acids as alpha-linolenic acid, making it one of the richest plant-based sources of PUFAs. This high concentration of PUFAs contributes to its nutritional and industrial applications.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While some oils like sunflower oil are rich in polyunsaturated fats, they typically do not reach the high levels found in linseed oil. Sunflower oil is predominantly rich in omega-6 fatty acids.
- **Option B:** This option does not specify the type of oil, making it difficult to assess directly. However, common vegetable oils like soybean or corn oil do contain significant amounts of PUFAs but generally not to the extent of linseed oil.
- **Option D:** This option also lacks specificity. Generally, animal fats and some vegetable oils have lower percentages of PUFAs compared to linseed oil.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **linseed oil (flaxseed oil)**, due to its high content of alpha-linolenic acid (an omega-3 fatty acid), is beneficial for heart health and has anti-inflammatory properties. However, it should be consumed in moderation and often requires processing to make its fatty acids more bioavailable.

## **Correct Answer:** C. Linseed oil.