Cannot implicitly convert type 'ORS.DTO.GenderDTO' to 'System.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?)

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I wanted to populate the dropdownlistfor form database but this error is arises... Can Someone help me with this to remove this error Cannot implicitly convert type 'ORS.DTO.GenderDTO' to 'System.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?)

i have to populate dropdownlist for Gender and have to get values that are stores in the database...

public IEnumerable<GenderDTO> GetGenderList()
    {
        GenderDTO model = new GenderDTO();
        var gender = from g in db.CAT_GENDER
                     select g;
        model.GenderList = new SelectList(gender, "ID", "Description");
        return model;
    }

public class GenderDTO
{
    public int ID { get; set; }
    public string Description { get; set; }

    public SelectList GenderList { get; set; }
}

 public partial class CAT_GENDER
{
    public CAT_GENDER()
    {
        USER_PROFILE = new HashSet<USER_PROFILE>();
    }

    public int ID { get; set; }

    [Required]
    [StringLength(50)]
    public string DESCRIPTION { get; set; }

    public int STATUS_ID { get; set; }

    public virtual CAT_RECORD_STATUS CAT_RECORD_STATUS { get; set; }

    public virtual ICollection<USER_PROFILE> USER_PROFILE { get; set; }
}