Read this and answer the question. If the question is unanswerable, say "unanswerable".

Executive Directors and Under-Secretaries General of the UN
2011–present Dr Babatunde Osotimehin (Nigeria)
2000–2010 Ms Thoraya Ahmed Obaid (Saudi Arabia)
1987–2000 Dr Nafis Sadik (Pakistan)
1969–87 Mr Rafael M. Salas (Philippines)

Who was Executive Director or Under-Secretary General from 2000 to 2010?
Thoraya Ahmed Obaid