What kind of solution is milk:A. SuspensionB. ColloidC. True solutionD. Alloy

Milk is classified as a **colloid**. Here's why:

### Explanation:
A colloid is a type of mixture where very small particles of one substance are evenly dispersed throughout another substance. The particles in a colloid are larger than those in a true solution but small enough to remain suspended and not settle out. They are typically in the size range of 1 to 1000 nanometers.

**Milk** is a colloidal system where fat globules (the dispersed phase) are distributed within water (the continuous phase). The fat droplets in milk do not settle out upon standing, which is a characteristic feature of colloids.

### Let's analyze other options:
- **A. Suspension**: A suspension is a heterogeneous mixture in which the particles are large enough to eventually settle out. Milk does not show this behavior, so it is not a suspension.

- **C. True solution**: In a true solution, the solute particles are molecular or ionic in size, and they are uniformly distributed without forming distinct phases. Milk has larger particles than a true solution, so it doesn't qualify as one.

- **D. Alloy**: An alloy is a mixture of two or more metals or a metal and a non-metal. Milk does not fit this definition.

### Correct Answer: **B. Colloid**