Please answer the following question: Information:  - Connecticut is the southernmost state in the New England region of the northeastern United States. Connecticut is also often grouped along with New York and New Jersey as the Tri-State Area. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its capital city is Hartford, and its most populous city is Bridgeport. The state is named for the Connecticut River, a major U.S. river that approximately bisects the state. The word "Connecticut" is derived from various anglicized spellings of an Algonquian word for "long tidal river".  - A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice.  - A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and its plan view being a parallelogram, rather than the rectangle that is the plan view of a regular, or "square" arch.  - The Yalesville Underpass is a 30 - degree skew arch bridge carrying the railroad over Route 150 close to its intersection with Route 71 in Wallingford , Connecticut . Built in 1838 for the railroad by William MacKenzie , it is reported to be the first underpass in America . The arch was designed to allowed tall hay wagons to pass through but it is not wide enough for modern two - way traffic , the one - way traffic being controlled by a pair of lights . The stone structure is also one of the oldest stone railroad bridges in America .  - In Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing to the Euclidean parallel postulate or one of its equivalent formulations.   - An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are typically used today.  - Wallingford is a town in New Haven County, Connecticut, United States. The population was 45,135 at the 2010 census.  - In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°). It can also be defined as a parallelogram containing a right angle. A rectangle with four sides of equal length is a square. The term oblong is occasionally used to refer to a non-square rectangle. A rectangle with vertices "ABCD" would be denoted as .  - An arch is a curved structure that spans a space and may or may not support weight above it. Arch may be synonymous with vault, but a vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures.  - In geometry and trigonometry, a right angle is an angle that bisects the angle formed by two adjacent parts of a straight line. More precisely, if a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. As a rotation, a right angle corresponds to a quarter turn (that is, a quarter of a full circle).    Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'yalesville underpass'.  Choices: - agriculture  - angle  - arch  - arch bridge  - census  - city  - condition  - construction  - county  - england  - enumeration  - information  - may  - method  - millennium  - plan  - plane  - population  - procedure  - region  - river  - roof  - side  - sound  - state  - structure  - territory  - town  - two  - word
Answer:
construction