Task: Question Answering
Input (English): In Sec. "Materials and Methods" we discuss our materials and methods, including the dataset we studied, how we preprocessed that data and extracted a `causal' corpus and a corresponding `control' corpus, and the details of the statistical and language analysis tools we studied these corpora with. 
 Question: Do they use expert annotations, crowdsourcing, or only automatic methods to analyze the corpora?
Output (English): Only automatic methods