instruction:
In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
question:
Question: Was Nathan Sivin alive when Han Zhenhua claimed that Nanhai referred to the Scarborough Shoal? Passage:The People's Republic of China and the Republic of China (Taiwan) claim that Chinese people discovered the shoal centuries ago and that there is a long history of Chinese fishing activity in the area. The shoal lies within the nine-dotted line drawn by China on maps marking its claim to islands and relevant waters consistent with United Nations Convention on the Law of the Sea (UNCLOS) within the South China Sea. An article published in May 2012 in the PLA Daily" states that Chinese astronomer Guo Shoujing went to the island in 1279, under the Yuan dynasty, as part of an empire-wide survey called "Measurement of the Four Seas" (), however, no such 13th century map has been made public by China nor such evidence on the existence of the map is known. In 1979 historical geographer Han Zhenhua () was among the first scholars to claim that the point called "Nanhai" (literally, "South Sea") in that astronomical survey referred to Scarborough Shoal. In 1980 during a conflict with Vietnam for sovereignty over the Paracel Islands (Xisha Islands), however, the Chinese government issued an official document claiming that "Nanhai" in the 1279 survey was located in the Paracels. Historical geographer Niu Zhongxun defended this view in several articles. In 1990, a historian called Zeng Zhaoxuan () argued instead that the Nanhai measuring point was located in Central Vietnam. Historian of astronomy Chen Meidong () and historian of Chinese science Nathan Sivin have since agreed with Zeng's position in their respective books about Guo Shoujing.

answer:
b

question:
Question: How many times was the person who sent 15,000 troops married? Passage:Halleck's plan, finalized in January 1864, called for Banks to take 20,000 troops up from New Orleans to Alexandria, including the 47th Pennsylvania Infantry, the only regiment from the Keystone State to fight in this campaign, on a route up the Bayou Teche (in Louisiana, the term bayou is used to refer to a slow moving river or stream), where they would be met by 15,000 troops sent down from Major General William T. Sherman's forces in Vicksburg, Mississippi, and under the command of Brigadier General A.J. Smith. Smith's forces were available to Banks only until the end of April, when they would be sent back east where they were needed for other Union military actions. Banks would command this combined force of 35,000, which would be supported in its march up the Red River towards Shreveport by Union Navy Rear Admiral David Dixon Porter's fleet of gunboats. At the same time, 7,000 Union troops from the Department of Arkansas under the command of Major General Frederick Steele would be sent south from Arkansas to rendezvous with Banks in his attack on Shreveport, and to serve as the garrison for that city after its capture.

answer:
b

question:
Question: Is Megan Cooke's time at the 2006 FISA World Rowing Championships good enough for a world record? Passage:Cooke was on the rowing team at the University of California at Berkely, earning first team All-American honors twice along with first team All-Region and first team All-Pac accolades. She was the co-captain of the rowing team her junior and senior years, earning fourth place at the 2000 NCAA Championships and third place in the 2002. In 2001 she won a silver medal in the women's four without coxswain at the 2001 World Under-23 Championships. Cooke joined the U.S. National Team for rowing in 2004. Her last year on the national team was 2007. In 2006, as part of the U.S. World Champion women's eight, she helped set a world record for Team USA. She was also a 2006 Henley Royal Regatta champion and 2006 Head of the Charles Regatta champion. She won a silver medal in coxless pairs and a gold medal in the women's pair with partner Anna Mickelson at the 2006 World Rowing Cup in Lucerne. She placed fifth in the 2006 World Rowling Cup in Munich. Cooke competed in the 2006 FISA World Rowing Championships in Eton, helping her team win a gold medal with a world best time of 5:55.50. She was a silver medalist at the World Rowing Cup in Lintz. An injury in 2008 set Cooke back during the Senior Women's National Team's bids for the 2008 Summer Olympics. She retired from the U.S. National Team in 2008.

answer:
b