Database: world_development_indicators
Question: What are the special notes for the country whose average adolescent fertility rate is the highest?
SQL: SELECT DISTINCT T1.SpecialNotes FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode WHERE T2.Value = ( SELECT Value FROM Indicators WHERE IndicatorName LIKE 'Adolescent fertility rate%' ORDER BY Value DESC LIMIT 1 )