Please answer the following question: Information:  - Structural engineering is mainly a sub-division of civil engineering where structural engineers are trained to understand, predict, and calculate the stability, strength and rigidity of built structures for buildings and non-building structures, to develop designs and integrate their design with that of other designers, and to supervise construction of projects on site. They can also be involved in the design of machinery, medical equipment, vehicles etc. where structural integrity affects functioning and safety.  - Structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals. Abstract structures include data structures in computer science and musical form. Types of structure include a hierarchy (a cascade of one-to-many relationships), a network featuring many-to-many links, or a lattice featuring connections between components that are neighbors in space.  - Civil Engineering History of the civil engineering profession. Engineering has been an aspect of life since the beginnings of human existence. The earliest practice of civil engineering may have commenced between 4000 and 2000 BC in ancient Egypt, the Indus Valley Civilization, and Mesopotamia (ancient Iraq) when humans started to abandon a nomadic existence, creating a need for the construction of shelter. During this time, transportation became increasingly important leading to the development of the wheel and sailing.  - Medical equipment (also known as armamentarium) is designed to aid in the diagnosis, monitoring or treatment of medical conditions.  - Structural engineers analyze, design, plan, and research structural components and structural systems to achieve design goals and ensure the safety and comfort of users or occupants. Their work takes account mainly of safety, technical, economic and environmental concerns, but they may also consider aesthetic and social factors.  - The term structural system or structural frame in structural engineering refers to load - resisting sub-system of a structure . The structural system transfers loads through interconnected structural components or members . Commonly used structures can be classified into five major categories , depending on the type of primary stress that may arise in the members of the structures under major design loads . However any two or more of the basic structural types described in the following may be combined in a single structure , such as a building or a bridge in order to meet the structures functional requirements . Tensile structures : Members of tensile structures are subjects to pure tension under the action of external loads . Because the tensile stress is uniformly distributed over the cross-sectional area of members , the material of such a structure is utilized in the most efficient manner . Compressive structures : Compression structures develop mainly compressive stresses under the action of axial loads . Because compressive structures are susceptible to buckling or instability , the possibility of such a failure should be considered in their designs if necessary , adequate bracing must be provided to avoid such failures . Trusses : Trusses are composed of straight members connected at their ends by hinged connections to form a stable configuration . Because of their light weight and high strength , are among the most commonly used type of structure . Shear structures : These are structures such as reinforced concrete shear walls , which are used in multistory buildings to reduce lateral movements due to wind loads and earthquake excitations . Shear structures develop mainly in - plane shear with relatively small bending stresses under the action of external loads . Bending structures : Bending structures develop mainly bending stresses under the action of external loads . The shear stresses associated with the changes in bending moments may also be significant should be considered in their designs .  - Design is the creation of a plan or convention for the construction of an object, system or measurable human interaction (as in architectural blueprints, engineering drawings, business processes, circuit diagrams, and sewing patterns). Design has different connotations in different fields (see design disciplines below). In some cases, the direct construction of an object (as in pottery, engineering, management, coding, and graphic design) is also considered to be design.    After reading the paragraphs above, we are interested in knowing the entity with which 'structural system' exhibits the relationship of 'subclass of'. Find the answer from the choices below.  Choices: - aid  - arrangement  - aspect  - building  - civil engineering  - computer  - computer science  - construction  - convention  - data  - design  - division  - engineering  - equipment  - human  - lattice  - man  - management  - material  - musical form  - natural  - network  - object  - research  - sewing  - stability  - structure  - system  - valley
Answer:
construction