In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
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The White Revolution in India, also known as Operation Flood.
It was a plan of three phases by the National Dairy Development Board to revitalise India's dairy production until India became self-sufficient in milk.
The program was so successful that by 1998, India was the world's largest milk producer.