बिहार को बंगाल प्रेसीडेंसी से आधिकारिक रूप से कब अलग किया गया था?
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This question examines an important Bihar General Knowledge fact: “On which date was Bihar officially separated from the Bengal Presidency?” The correct answer is 22 March 1912. Bihar became a separate province on 22 March 1912 after being carved out of the Bengal Presidency. The answer 22 March 1912 matches that requirement directly. Option B (15 August 1947) does not match the exact person, district, site, institution, event or association required by the question. Option C (26 January 1950) does not match the exact person, district, site, institution, event or association required by the question. Option D (1 April 1936) does not match the exact person, district, site, institution, event or association required by the question.