user: Teacher: Generate an appropriate single-sentence summary for the given text such that it includes the main topic of the text.
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By Marianna SpringSpecialist disinformation reporter, BBC News The adverts show the Democratic Party challenger with an earpiece, and say that he refused to have his ears checked for devices prior to the debate. The Biden campaign rejected the claims. The Trump campaign adverts ask: "Why won't Sleepy Joe commit to an ear test?" and "Who is in Joe's ear?" Accusations that presidential candidates have received debate help via hidden hearing devices are familiar, albeit unproven. Such allegations have been levelled against both Republican and Democratic candidates in the past. Prior to Tuesday's debate, the rumour about Mr Biden's supposed earpiece was circulating on several social networks, and was being promoted by the Trump campaign. At least 15 versions The advertising campaign was launched after the debate, and also promotes two other baseless but widely shared rumours about Mr Biden. One suggested he asked for breaks during the debate, and another accused him of refusing a "drug test". The photo featured in the advert is not from Tuesday's debate. It was first shared online in September 2019. In a number of the adverts, it has been doctored to show Mr Biden wearing wireless Apple headphones. This was not the case in the original image. Some versions circle the ear featuring the headphone. By Wednesday evening, there were at least 15 different versions of the advert, and according to Facebook's Ad Library, they had reached at least 10 million users. Facebook has pledged to label posts containing voting misinformation and point users towards accurate information ahead of the election. However its policy does not involve fact-checking political speech, including in advertisements. The company declined to comment about the latest Trump ad campaign. Rumour origins Hours before the debate, the claims went viral on Facebook and YouTube. Identical memes were pushed by a number of popular Facebook pages with names such as US Conservative and Unhinged Left. They claimed "Joe Biden should be inspected for a hidden earpiece as well as submit to a drug test before the debate". These memes are subject to fact-checks - and some have had warning labels applied to them on Facebook. The claims were picked up by Fox News and other conservative news outlets. They were further amplified by supporters of QAnon, an unfounded a conspiracy theory that claims President Trump is fighting a secret war against elite Satan-worshipping paedophiles. Those who believe in QAnon are known for promoting political disinformation on social media which targets opponents of the president. They shared close-up pictures of Mr Biden's ears, alleging a listening device was visible. During the debate, some also shared photos of a fold in Mr Biden's shirt, claiming it was caused by a wire, and of a supposed device on his wrist, where he wears a rosary in memory of his late son Beau. Nothing new Conspiracy theories about secret listening devices have been recycled in presidential election campaigns for the past two decades. Democratic candidate Hillary Clinton faced similar unfounded claims ahead of the 2016 presidential election. In 2004, rumours circulated among left-wing sites and blogs that President George W Bush was being aided by a secret earpiece. None of those allegations were found to be true. Even if a candidate did wear an earpiece, any advantage would be questionable. As TV and radio presenters can attest, listening to someone while simultaneously talking during the back-and-forth of a live event is a difficult skill to master.
Solution: US President Donald Trump's re-election campaign is running hundreds of Facebook advertisements pushing an unfounded conspiracy theory that Joe Biden cheated during the first US presidential debate.
Reason: This is a relevant summary for the given paragraph. It also contains explicit phrases from the given text

Now, solve this instance: In April, the City of London Corporation (CLC) approved the 1,000ft (305m) Tulip tower proposed for Bury Street, beside the Gherkin tower. But Sadiq Khan said a number of concerns raised in a London Review Panel report meant it would harm the skyline and had few public benefits. Those behind the project said they were "disappointed" and have a right to appeal the mayor's decision. Mr Khan advised CLC planners to reject permission on the basis of reasons outlined by the panel, which included: The London Review Panel concluded The Tulip "does not represent world class architecture, it lacks sufficient quality and quantity of public open space, and its social and environmental sustainability do not match the ambition of its height and impact on London's skyline". A spokesperson for the mayor said Mr Khan had "a number of serious concerns with this application and having studied it in detail has refused permission for a scheme that he believes would result in very limited public benefit". The Foster + Partners-designed tower was to be built at 20 Bury Street. The CLC Planning and Transportation Committee had supported the plan by 18 votes to seven after conditions were imposed such as restricting ticket sales during peak hours. Responding to the mayor's recommendation, architects Foster + Partners and developers J Safra said: "The Tulip Project team are disappointed by the Mayor of London's decision to direct refusal of planning permission. "We will now take time to consider potential next steps for The Tulip Project." The applicants have the right to appeal directly to the Secretary of State for Housing, Communities and Local Government within six months if the CLC goes ahead and refuses planning permission. The government department may also step in and direct the CLC to hold off a refusal for a period it specifies.
Student:

assistant: London's Mayor has advised planners to reject proposals for a new skyscraper.