context: SD Jakarta (Graduated 1981) SMP Jakarta (Graduated 1984) Pangudi Luhur High School, Jakarta (Graduated 1987) Bachelor of Science in Business Administration, University of Arizona - United States (Graduated 1991) Master of Business Administration, Creighton University Ohama - United States ( Lukus 1993) Diploma in Business Economics program, Strathclyde University, Glasgow (Graduated 1998) Doctor of Business Administration, Manchester Businees School - Manchester, United Kingdom (Graduated 2005)
question: was Sihar Sitorus's last education?
answers.text: Doctor