Please list the patient's ID whose creatinine level is normal and whose anti Cardiolipin antibody concentration level is the highest.
creatinine level is normal refers to CRE < 1.5; anti Cardiolipin antibody concentration level is the highest refers to MAX(aCL IgA);
SELECT T2.ID FROM Laboratory AS T1 INNER JOIN Examination AS T2 ON T1.ID = T2.ID WHERE T1.CRE < 1.5 ORDER BY T2.`aCL IgA` DESC LIMIT 1