Definition: Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Input: Context: Sharpe's Challenge is a British TV film from 2006, usually shown in two parts, which is part of an ITV series based on Bernard Cornwell's historical fiction novels about the English soldier Richard Sharpe during the Napoleonic Wars. 
 Question: Which is the basis of Sharpe's Challenge?
Output:
richard sharpe