Read this: In 1803, an Act of Parliament, promoted by the East India Company, established the East India Dock Company, with the aim of establishing a new set of docks (the East India Docks) primarily for the use of ships trading with India. The existing Brunswick Dock, part of the Blackwall Yard site, became the Export Dock; while a new Import Dock was built to the north. In 1838 the East India Dock Company merged with the West India Dock Company. The docks were taken over by the Port of London Authority in 1909, and closed in 1967.

in 1838 what company did the  East india dock company merge with? 
What is the answer? (If it cannot be answered, return "unanswerable")
West India Dock Company