public class Country
{
    private static Random _random = new Random();
    private static Country[] _countries = new Country[5]
        {
                new Country()
                {
                     Name = "France",
                     Capital = "Paris"
                },
                new Country()
                {
                     Name = "Japan",
                     Capital = "Tokyo"
                },
                new Country()
                {
                     Name = "China",
                     Capital = "Beijing"
                },
                new Country()
                {
                     Name = "Spain",
                     Capital = "Madrid"
                },
                new Country()
                {
                     Name = "India",
                     Capital = "New Delhi"
                }
        };

    public string Name { get; set; }
    public string Capital { get; set; }

    public override string ToString() => $"{Name},{Capital}";
    public static Country GetCountry() => _countries[_random.Next(0, _countries.Length - 1)];
    public static Country GetCountry(int index) => _countries[index];
}