TASK DEFINITION: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
PROBLEM: The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue. In many species, the immune system can be classified into subsystems, such as the innate immune system versus the adaptive immune system, or humoral immunity versus cell-mediated immunity. In humans, the blood -- brain barrier, blood -- cerebrospinal fluid barrier, and similar fluid -- brain barriers separate the peripheral immune system from the neuroimmune system, which protects the brain.

SOLUTION: how many immune systems does the body have

PROBLEM: American Idol is an American singing competition television series created by Simon Fuller, produced by FremantleMedia North America and 19 Entertainment, and distributed by FremantleMedia North America. It initially aired on Fox from June 11, 2002 to April 7, 2016 for 15 seasons. On March 11, 2018, the 16th season made its debut on ABC.

SOLUTION: how many years was american idol off tv

PROBLEM: With respect to its colonies, British mercantilism meant that the government and the merchants became partners with the goal of increasing political power and private wealth, to the exclusion of other empires. The government protected its merchants -- and kept others out -- through trade barriers, regulations, and subsidies to domestic industries in order to maximize exports from and minimize imports to the realm. The government had to fight smuggling, which became a favorite American technique in the 18th century to circumvent the restrictions on trading with the French, Spanish, or Dutch. The goal of mercantilism was to run trade surpluses, so that gold and silver would pour into London. The government took its share through duties and taxes, with the remainder going to merchants in Britain. The government spent much of its revenue on a superb Royal Navy, which not only protected the British colonies but threatened the colonies of the other empires, and sometimes seized them. Thus the British Navy captured New Amsterdam (New York) in 1664. The colonies were captive markets for British industry, and the goal was to enrich the mother country.

SOLUTION:
what was the british economic policy of mercantilism