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: Most migrations begin with the birds starting off in a broad front. Often, this front narrows into one or more preferred routes termed flyways. These routes typically follow mountain ranges or coastlines, sometimes rivers, and may take advantage of updrafts and other wind patterns or avoid geographical barriers such as large stretches of open water. The specific routes may be genetically programmed or learned to varying degrees. The routes taken on forward and return migration are often different. A common pattern in North America is clockwise migration, where birds flying North tend to be further West, and flying South tend to shift Eastwards. Question: What obsticals will migrating birds avoid?
[EX A]: large stretches of open water

[EX Q]: Passage: Under the 1963 constitution, Massamba-Débat was elected President for a five-year term. During Massamba-Débat's term in office the regime adopted "scientific socialism" as the country's constitutional ideology. In 1965, Congo established relations with the Soviet Union, the People's Republic of China, North Korea and North Vietnam. Massamba-Débat's regime also invited several hundred Cuban army troops into the country to train his party's militia units and these troops helped his government survive a coup in 1966 led by paratroopers loyal to future President Marien Ngouabi. Nevertheless, Massamba-Débat was unable to reconcile various institutional, tribal and ideological factions within the country and his regime ended abruptly with a bloodless coup d'état in September 1968. Question: When did Massamba-Debat lose power in the Congo?
[EX A]: September 1968

[EX Q]: Passage: This allowed any English firm to trade with India, unless specifically prohibited by act of parliament, thereby annulling the charter that had been in force for almost 100 years. By an act that was passed in 1698, a new "parallel" East India Company (officially titled the English Company Trading to the East Indies) was floated under a state-backed indemnity of £2 million. The powerful stockholders of the old company quickly subscribed a sum of £315,000 in the new concern, and dominated the new body. The two companies wrestled with each other for some time, both in England and in India, for a dominant share of the trade. Question: enlish firms were allow to trade with  India unless?
[EX A]:
prohibited by act of parliament