Input: Infection
Persistent infections occur because the body is unable to clear the organism after the initial infection. Persistent infections are characterized by the continual presence of the infectious organism, often as latent infection with occasional recurrent relapses of active infection. There are some viruses that can maintain a persistent infection by infecting different cells of the body. Some viruses once acquired never leave the body. A typical example is the herpes virus, which tends to hide in nerves and become reactivated when specific circumstances arise.

Why do persistent infections occur?
Output: body is unable to clear the organism after the initial infection

Input: Airport
Most of the world's airports are owned by local, regional, or national government bodies who then lease the airport to private corporations who oversee the airport's operation. For example, in the United Kingdom the state-owned British Airports Authority originally operated eight of the nation's major commercial airports - it was subsequently privatized in the late 1980s, and following its takeover by the Spanish Ferrovial consortium in 2006, has been further divested and downsized to operating just five. Germany's Frankfurt Airport is managed by the quasi-private firm Fraport. While in India GMR Group operates, through joint ventures, Indira Gandhi International Airport and Rajiv Gandhi International Airport. Bengaluru International Airport and Chhatrapati Shivaji International Airport are controlled by GVK Group. The rest of India's airports are managed by the Airports Authority of India.

How many commercial airports did the British Airports Authority originally operate?
Output: eight

Input: Order of the British Empire
The members of The Beatles were made MBEs in 1965. John Lennon justified the comparative merits of his investiture by comparing military membership in the Order: "Lots of people who complained about us receiving the MBE [status] received theirs for heroism in the war – for killing people… We received ours for entertaining other people. I'd say we deserve ours more." Lennon later returned his MBE insignia on 25 November 1969 as part of his ongoing peace protests. Other criticism centres on the claim that many recipients of the Order are being rewarded with honours for simply doing their jobs; critics claim that the civil service and judiciary receive far more orders and honours than leaders of other professions.

Who said "lots of people who complained about us receiving the MBE received thris for heroism in the war.
Output: John Lennon

Input: Dutch Republic
Beginning in the 18th century, the situation changed from more or less active persecution of religious services to a state of restricted toleration of other religions, as long as their services took place secretly in private churches.

When did the active persecution of religious services become more of a restricted tolerance?
Output:
in the 18th century