This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Input: Consider Input: Passage: There has, however, been interest among railroad operators in returning to DC use at higher voltages than previously used. At the same voltage, DC often has less loss than AC, and for this reason high-voltage direct current is already used on some bulk power transmission lines. DC avoids the electromagnetic radiation inherent with AC, and on a railway this also reduces interference with signalling and communications and mitigates hypothetical EMF risks. DC also avoids the power factor problems of AC. Of particular interest to railroading is that DC can supply constant power with a single ungrounded wire. Constant power with AC requires three-phase transmission with at least two ungrounded wires. Another important consideration is that mains-frequency 3-phase AC must be carefully planned to avoid unbalanced phase loads. Parts of the system are supplied from different phases on the assumption that the total loads of the 3 phases will even out. At the phase break points between regions supplied from different phases, long insulated supply breaks are required to avoid them being shorted by rolling stock using more than one pantograph at a time. A few railroads have tried 3-phase but its substantial complexity has made single-phase standard practice despite the interruption in power flow that occurs twice every cycle. An experimental 6 kV DC railway was built in the Soviet Union.

Output: Railroad operators have shown little interest in returning to what?


Input: Consider Input: Passage: Between 1925 and 1940, philanthropic foundations, especially ones connected with the Rockefellers, contributed about $7 million to support the Yale Institute of Human Relations and the affiliated Yerkes Laboratories of Primate Biology. The money went toward behavioral science research, which was supported by foundation officers who aimed to "improve mankind" under an informal, loosely defined human engineering effort. The behavioral scientists at Yale, led by President James R. Angell and psychobiologist Robert M. Yerkes, tapped into foundation largesse by crafting research programs aimed to investigate, then suggest, ways to control, sexual and social behavior. For example, Yerkes analyzed chimpanzee sexual behavior in hopes of illuminating the evolutionary underpinnings of human development and providing information that could ameliorate dysfunction. Ultimately, the behavioral-science results disappointed foundation officers, who shifted their human-engineering funds toward biological sciences.

Output: How much did philanthropic foundations donate between 1935 and 1940?


Input: Consider Input: Passage: In a 'Letter to American People' written by Osama bin Laden in 2002, he stated that one of the reasons he was fighting America is because of its support of India on the Kashmir issue. While on a trip to Delhi in 2002, U.S. Secretary of Defense Donald Rumsfeld suggested that Al-Qaeda was active in Kashmir, though he did not have any hard evidence. An investigation in 2002 unearthed evidence that Al-Qaeda and its affiliates were prospering in Pakistan-administered Kashmir with tacit approval of Pakistan's National Intelligence agency Inter-Services Intelligence. A team of Special Air Service and Delta Force was sent into Indian-administered Kashmir in 2002 to hunt for Osama bin Laden after reports that he was being sheltered by the Kashmiri militant group Harkat-ul-Mujahideen. U.S. officials believed that Al-Qaeda was helping organize a campaign of terror in Kashmir in order to provoke conflict between India and Pakistan. Fazlur Rehman Khalil, the leader of the Harkat-ul-Mujahideen, signed al-Qaeda's 1998 declaration of holy war, which called on Muslims to attack all Americans and their allies. Indian sources claimed that In 2006, Al-Qaeda claimed they had established a wing in Kashmir; this worried the Indian government. India also claimed that Al-Qaeda has strong ties with the Kashmir militant groups Lashkar-e-Taiba and Jaish-e-Mohammed in Pakistan. While on a visit to Pakistan in January 2010, U.S. Defense secretary Robert Gates stated that Al-Qaeda was seeking to destabilize the region and planning to provoke a nuclear war between India and Pakistan.


Output: Who did India support on the Kashmir issue?