Keyword Answer Extractor

Given a context paragraph and a question, find the sentence in the context that has the most keyword overlap with the question. Return that sentence as the answer.

Input format:

• Line 1: The context (sentences separated by periods)
• Line 2: The question

Keywords are all words (lowercased) except common stop words: {"the", "a", "an", "is", "are", "was", "were", "in", "on", "at", "to", "for", "of", "and", "or", "it", "this", "that", "what", "which", "who", "where", "when", "how", "do", "does", "did"}.

If there's a tie, return the first matching sentence.