Question: Give me the immunization codes and dates on which Ms. Jacquelyn Shanahan was immunized with influenza seasonal injectable preservative-free vaccine.
SQL: SELECT DISTINCT T2.CODE, T2.DATE FROM patients AS T1 INNER JOIN immunizations AS T2 ON T1.patient = T2.PATIENT WHERE T1.prefix = 'Ms.' AND T1.first = 'Jacquelyn' AND T1.last = 'Shanahan' AND T2.DESCRIPTION = 'Influenza  seasonal  injectable  preservative free'