What is the frequency of the model whose part number is ado520biaa5do? 
{'header': ['Model Number', 'Stepping', 'Frequency', 'L2 Cache', 'HT', 'Multi 1', 'V Core', 'TDP', 'Socket', 'Release Date', 'Part Number(s)'], 'page_title': 'List of AMD Athlon X2 microprocessors', 'section_title': "Business-class 'B' series", 'caption': "Business-class 'B' series", 'rows': [['Athlon X2 4450B', 'G2', '2300MHz', '2 × 512 kB', '1.0GHz', '11.5×', '1.15 - 1.25 V', '45 W', 'Socket AM2', 'April 28, 2008', 'ADH445BIAA5DO'], ['Athlon X2 4850B', 'G2', '2500MHz', '2 × 512 kB', '1.0GHz', '12.5×', '1.1 - 1.35 V', '45 W', 'Socket AM2', 'August 18, 2008', 'ADH485BIAA5DO'], ['Athlon X2 5000B', 'G2', '2600MHz', '2 × 512 kB', '1.0GHz', '13×', '1.325 - 1.375 V', '65 W', 'Socket AM2', 'April 28, 2008', 'ADO500BIAA5DO'], ['Athlon X2 5200B', 'G2', '2700MHz', '2 × 512 kB', '1.0GHz', '13.5×', '1.325 - 1.375 V', '65 W', 'Socket AM2', 'April 28, 2008', 'ADO520BIAA5DO'], ['Athlon X2 5400B', 'G2', '2800MHz', '2 × 512 kB', '1.0GHz', '14×', '1.3 - 1.35 V', '65 W', 'Socket AM2', 'April 28, 2008', 'ADO540BIAA5DO']]}