Database: thrombosis_prediction
Question: What is the most common illness that doctors identified among the patients whose lab work was done between 1/1/1985, and 12/31/1995?
SQL: SELECT T2.Diagnosis FROM Examination AS T1 INNER JOIN Patient AS T2 ON T1.ID = T2.ID WHERE T1.`Examination Date` BETWEEN '1985-01-01' AND '1995-12-31' GROUP BY T2.Diagnosis ORDER BY COUNT(T2.Diagnosis) DESC LIMIT 1