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If, on Purim, "Reuvein" asks "Shimon" if the latter knows the difference between Haman and Mordechai may Shimon lie and answer 'No'?
Yes! According to the Maharsha in his chiddushei aggadot on talmud bava metzia (s.v. b'puryah). CF Titen Emes L’Yaakov page 52:26. Moadim V’zemanim (Rav Moshe Shternbuch shlitah) 6:109 who explains this opinion.