This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

[EX Q]: Passage: Cultural depictions of dogs in art extend back thousands of years to when dogs were portrayed on the walls of caves. Representations of dogs became more elaborate as individual breeds evolved and the relationships between human and canine developed. Hunting scenes were popular in the Middle Ages and the Renaissance. Dogs were depicted to symbolize guidance, protection, loyalty, fidelity, faithfulness, watchfulness, and love. Question: Thousands of years ago, dogs were depicted on the walls of what?
[EX A]: caves.

[EX Q]: Passage: In January 1956, the new Constitution of Egypt was drafted, entailing the establishment of a single-party system under the National Union (NU), a movement Nasser described as the "cadre through which we will realize our revolution". The NU was a reconfiguration of the Liberation Rally, which Nasser determined had failed in generating mass public participation. In the new movement, Nasser attempted to incorporate more citizens, approved by local-level party committees, in order to solidify popular backing for his government. The NU would select a nominee for the presidential election whose name would be provided for public approval. Question: What was the dominant political party? 
[EX A]: National Union

[EX Q]: Passage: The World Health Organization and the UN Environment Programme estimate that each year, 3 million workers in agriculture in the developing world experience severe poisoning from pesticides, about 18,000 of whom die. Owing to inadequate regulation and safety precautions, 99% of pesticide related deaths occur in developing countries that account for only 25% of pesticide usage. According to one study, as many as 25 million workers in developing countries may suffer mild pesticide poisoning yearly. There are several careers aside from agriculture that may also put individuals at risk of health effects from pesticide exposure including pet groomers, groundskeepers, and fumigators. Question: In developing countries, how many workers are exposed to mild pesticide poisining?
[EX A]:
as 25 million