## Core Concept
Human milk and cow's milk have distinct compositions tailored to the nutritional needs of their respective consumers. The primary differences lie in their protein, fat, carbohydrate, and mineral content. These variations are crucial for the growth and development of infants.

## Why the Correct Answer is Right
Human milk contains a higher proportion of **whey proteins** (like lactoferrin and lysozyme) compared to cow's milk, which has more **casein**. Whey proteins are easier to digest and provide significant immune benefits. Additionally, human milk has a better fatty acid profile for brain development and higher levels of certain vitamins and immunoglobulins. The lactose content is also higher in human milk, supporting brain development and energy needs.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because human milk actually has a lower concentration of minerals compared to cow's milk. This is beneficial as it reduces the osmotic load on the infant's kidneys.
- **Option B:** Incorrect because cow's milk contains more casein and different types of proteins that are harder for human infants to digest.
- **Option C:** While human milk does contain a higher lactose content compared to cow's milk, this option does not directly address the question's implied focus on overall nutritional and immunological benefits.

## Clinical Pearl / High-Yield Fact
A crucial point to remember is that **human milk contains live cells**, including **fat cells** and **immunoglobulins**, which provide immune protection to infants. This unique characteristic is not replicable with formula or cow's milk, making breast milk particularly valuable for infant nutrition.

## Correct Answer Line
**Correct Answer: D. Higher lactose content.**