TSQL : Fetch Service Account name

TSQL to get the SQL Server service account.

DECLARE @MSSqlService VARCHAR(50)
EXECUTE master.dbo.xp_instance_regread
 N'HKEY_LOCAL_MACHINE'
,N'SYSTEM\CurrentControlSet\Services\MSSQLSERVER'
,N'ObjectName'
,@MSSqlService OUTPUT
,N'no_output'
SELECT @MSSqlService AS SQL_Service_Account