List the full name of all past legislators that chose Pro-Administration as their political party in year 1791.
full name refers to official_full_name; chose Pro-Administration as their political party refers to party = 'Pro-Administration'; 1791 refers to start < = 1791 AND END > = 1791
SELECT T1.first_name, T1.last_name FROM historical AS T1 INNER JOIN `historical-terms` AS T2 ON T1.bioguide_id = T2.bioguide WHERE T2.party = 'Pro-Administration' AND CAST(T2.start AS DATE) <= 1791 AND CAST(T2.END AS DATE) >= 1791