<?xml version="1.0" standalone="yes"?>
<Paper uid="W03-1210">
  <Title>Automatic Detection of Causal Relations for Question Answering</Title>
  <Section position="7" start_page="0" end_page="0" type="concl">
    <SectionTitle>
7 Discussion and Conclusions
</SectionTitle>
    <Paragraph position="0"> The approach presented in this paper for the detection and validation of causation patterns is a novel one. Other authors (Khoo et al. 2000) restricted their text corpus to a medical/business database and used hand-coded causation patterns that were mostly unambiguous. Our method discovers automatically generally applicable lexico-syntactic patterns referring to causation and disambiguates the causation relationships obtained from the pattern application on</Paragraph>
    <Section position="1" start_page="0" end_page="0" type="sub_section">
      <SectionTitle>
Question Question Answer
</SectionTitle>
      <Paragraph position="0"> Class QA without causation module QA with causation module Explicit What causes post- Post-traumatic Stress Disorder - What Post-traumatic stress disorder traumatic stress disorder? are the Symptoms and Causes? results from a traumatic event.</Paragraph>
      <Paragraph position="1"> What are the effects Projects, reports, and information about Acid rain is known to of acid rain? the effects of acid rain contribute to the corrosion of metals..</Paragraph>
      <Paragraph position="2"> Ambiguous What can trigger The protein is consistent with something An antigen producing an allergic an allergic reaction? that triggers an allergic reaction reaction is defined as an allergen. What phenomenon is .. that deglaciation are associated There are often earthquakes with volcanoes? associated with increased volcanic activity.. generated by volcanism..  text. Moreover, we showed that the automatic detection of causal relations is very important in Question Answering for answering cause-effect questions.</Paragraph>
    </Section>
  </Section>
class="xml-element"></Paper>