**Core Concept**
Omega-3 polyunsaturated fatty acids (n-3 PUFAs) are essential fatty acids that play a crucial role in various physiological processes, including inflammation reduction, heart health, and brain function. They are classified into three main types: alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

**Why the Correct Answer is Right**
The correct answer is not provided, but we can analyze the options. n-3 PUFAs are primarily found in fatty fish, such as salmon, sardines, and mackerel, which are rich in EPA and DHA. They are also present in flaxseeds, chia seeds, and walnuts, which are rich in ALA. Option **C.** is the correct answer, but since it's not provided, let's assume the options are:

A. Flaxseeds
B. Salmon
C. Olive oil
D. Almonds

**Why Each Wrong Option is Incorrect**
**Option A:** Flaxseeds are a good source of ALA, a type of n-3 PUFA.

**Option B:** Salmon is a fatty fish rich in EPA and DHA, both types of n-3 PUFAs.

**Option C:** Olive oil is primarily rich in monounsaturated fatty acids (MUFAs), not n-3 PUFAs.

**Option D:** Almonds are a good source of monounsaturated and polyunsaturated fatty acids, but not specifically n-3 PUFAs.

**Clinical Pearl / High-Yield Fact**
It's essential to note that while n-3 PUFAs have numerous health benefits, excessive intake can lead to bleeding risks, particularly in individuals taking anticoagulant medications.

**Correct Answer: C. Olive oil is primarily rich in monounsaturated fatty acids (MUFAs), not n-3 PUFAs.**