instruction:
In this task you will be given a passage and a yes/no question based on the passage. You should answer the question using the information from the passage.
question:
passage: A signature page has a line for the signature of a passport holder. A passport is not valid until it is signed by the passport holder. If a holder is unable to sign his passport, it is to be signed by a person who has legal authority to sign on the holder's behalf.
question: is a us passport valid if not signed?
answer:
No

question:
passage: Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring. Heteropaternal superfecundation refers to the fertilization of two separate ova by two different fathers. Homopaternal superfecundation refers to the fertilization of two separate ova from the same father, leading to fraternal twins. While heteropaternal superfecundation is referred to as a form of atypical twinning, genetically, the twins are half siblings. Superfecundation, while rare, can occur through either separate occurrences of sexual intercourse or through artificial insemination.
question: can a woman have twins from two different fathers?
answer:
Yes

question:
passage: Since 1942 the United States has maintained air bases in the United Kingdom. Major Commands of the USAF having bases in the United Kingdom were the United States Air Forces in Europe (USAFE), Strategic Air Command (SAC), and Air Mobility Command (AMC).
question: are there us military bases in the uk?
answer:
Yes