Answers for "dropdown in unity inspector"

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; 
}

dropdown in unity inspector

enum myEnum // your custom enumeration {    Item1,     Item2,     Item3 }; var dropDown = myEnum.Item1;  // this public var should appear as a drop down

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