This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Elizabeth's only sibling, Princess Margaret, was born in 1930. The two princesses were educated at home under the supervision of their mother and their governess, Marion Crawford, who was casually known as "Crawfie". Lessons concentrated on history, language, literature and music. Crawford published a biography of Elizabeth and Margaret's childhood years entitled The Little Princesses in 1950, much to the dismay of the royal family. The book describes Elizabeth's love of horses and dogs, her orderliness, and her attitude of responsibility. Others echoed such observations: Winston Churchill described Elizabeth when she was two as "a character. She has an air of authority and reflectiveness astonishing in an infant." Her cousin Margaret Rhodes described her as "a jolly little girl, but fundamentally sensible and well-behaved".
Who was Elizabeth only sibling?P

The official position of the Ministry of Foreign Affairs of the People's Republic of China is that the Ming implemented a policy of managing Tibet according to conventions and customs, granting titles and setting up administrative organs over Tibet. The State Council Information Office of the People's Republic states that the Ming dynasty's Ü-Tsang Commanding Office governed most areas of Tibet. It also states that while the Ming abolished the policy council set up by the Mongol Yuan to manage local affairs in Tibet and the Mongol system of Imperial Tutors to govern religious affairs, the Ming adopted a policy of bestowing titles upon religious leaders who had submitted to the Ming dynasty. For example, an edict of the Hongwu Emperor in 1373 appointed the Tibetan leader Choskunskyabs as the General of the Ngari Military and Civil Wanhu Office, stating:
Who abolished the policy council?

Because of the city's prominent role in the American Revolution, several historic sites relating to that period are preserved as part of the Boston National Historical Park. Many are found along the Freedom Trail, which is marked by a red line of bricks embedded in the ground. The city is also home to several art museums, including the Museum of Fine Arts and the Isabella Stewart Gardner Museum. The Institute of Contemporary Art is housed in a contemporary building designed by Diller Scofidio + Renfro in the Seaport District. The University of Massachusetts Boston campus on Columbia Point houses the John F. Kennedy Library. The Boston Athenaeum (one of the oldest independent libraries in the United States), Boston Children's Museum, Bull & Finch Pub (whose building is known from the television show Cheers), Museum of Science, and the New England Aquarium are within the city.
What is preserved in the Boston national Historical Park?