World Book Fair 2012, Vedanta to merge sterlite with Sesa Goa

Which Asian country was recently taken off the list of polio endemic countries by the World Health Organisation?
India

Which company is Vedanta set to merge with Sesa Goa?
Sterlite

Where in India 9-day 20th World Book Fair is held?
New Delhi

Where does India's forex reserves stand for the week ended 17th February 2012?
$293.44 billion

Name the operating system launched by Black Berry-maker Research in Motion for its PlayBook tablet.
PlayBook OS 2.0