dropdown box in inspector unity code example

Example 1: unity dropdown

Documentation : https://docs.unity3d.com/2018.4/Documentation/ScriptReference/UI.Dropdown.html

Adding a drpodown menu to your game : https://www.youtube.com/watch?v=5onggHOiZaw

Example 2: unity create drop down menu in inspector

public class Player : Monobehaviour
{
 	public List<string> NameList;
    [Dropdown("NameList")]//input the path of the list
    public string MyName; 
}