Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.

Q: Paragraph: In republics with a parliamentary system ( such as India , Germany , Austria , Italy and Israel ) the head of state is usually titled president and the principal functions of such presidents are mainly ceremonial and symbolic , as opposed to the presidents in a presidential or semi-presidential system .
Question: what do we call the head of state in india

A: president
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Q: Paragraph: Halley 's Comet or Comet Halley , officially designated 1P / Halley , is a short - period comet visible from Earth every 74 -- 79 years . Halley is the only known short - period comet that is regularly visible to the naked eye from Earth , and the only naked - eye comet that might appear twice in a human lifetime . Halley last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061 .
Question: when is halley's comet coming around again

A: mid-2061
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Q: Paragraph: The European Union is a sui generis supranational union possessing '' country - like '' characteristics . The entity is composed of 28 member countries . Its population density has been estimated at 116 people per km , and it would be ranked 95th if it were included in the list . ( population : 506,913,394 on January 1 , 2014 , area : 4,324,782 km ) . See also : List of regional organizations by population . The most densely populated sovereign nation is Monaco , with a population density of 18,713 people / km . Area includes land and water .
Question: country with highest population density per square mile

A:
Monaco
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