Members of these groups were referred to as male or female on the voter rolls in the past. Now they will have the choice to pick "O" -- for others -- when indicating their gender on voter forms, the Indian election commission said in a statement Thursday.
India, home to more than 1 billion people, has 714 million registered voters.
In July, an Indian court delivered a landmark ruling legalizing gay sex between consenting partners in the country.
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