Q: Information: - A train is a form of rail transport consisting of a series of vehicles that usually runs along a rail track to transport cargo or passengers. Motive power is provided by a separate locomotive or individual motors in self-propelled multiple units. Although historically steam propulsion dominated, the most common modern forms are diesel and electric locomotives, the latter supplied by overhead wires or additional rails. Other energy sources include horses, engine or water-driven rope or wire winch, gravity, pneumatics, batteries, and gas turbines. Train tracks usually consist of two running rails, sometimes supplemented by additional rails such as electric conducting rails and rack rails, with a limited number of monorails and maglev guideways in the mix. The word 'train' comes from the Old French "trahiner", from the Latin "trahere" 'pull, draw'. - A vehicle (from ) is a mobile machine that transports people or cargo. Typical vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses), railed vehicles (trains, trams), watercraft (ships, boats), aircraft and spacecraft. - A head - on collision is a traffic collision where the front ends of two vehicles such as cars , trains , ships or planes hit each other in opposite directions , as opposed to a side collision or rear - end collision . - A traffic collision, also known as a motor vehicle collision (MVC) among others, occurs when a vehicle collides with another vehicle, pedestrian, animal, road debris, or other stationary obstruction, such as a tree or pole. Traffic collisions may result in injury, death and property damage. - A rear-end collision (often called simply rear-end or in the UK a shunt) is a traffic accident wherein a vehicle (usually an automobile or a truck) crashes into the vehicle in front of it. Common factors that contribute to rear-end collisions include by driver inattention or distraction, tailgating, panic stops, and reduced traction due to weather or worn pavement. It may also be a rail accident wherein a train runs into the rear of a preceding train. - A truck (United States, Canada, Australia, New Zealand, Puerto Rico and Pakistan; also called a lorry in the United Kingdom, Ireland, South Africa, Malaysia, Singapore, and India) is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration; smaller varieties may be mechanically similar to some automobiles. Commercial trucks can be very large and powerful, and may be configured to mount specialized equipment, such as in the case of fire trucks and concrete mixers and suction excavators. - Tailgating is the act of driving on a road too close to the vehicle in front, such that the distance between the two vehicles does not guarantee that stopping to avoid collision is possible. - A motor vehicle is a self-propelled road vehicle and off-road vehicle, commonly wheeled, that does not operate on rails, such as trains or trams and used for commercial purposes on the highways in the transportation of passengers, or passengers and property. - A parking lot (Australian and British English: car park), also known as a car lot, is a cleared area that is intended for parking vehicles. Usually, the term refers to a dedicated area that has been provided with a durable or semi-durable surface. In most countries where cars are the dominant mode of transportation, parking lots are a feature of every city and suburban area. Shopping malls, sports stadiums, megachurches and similar venues often feature parking lots of immense area. - Side collisions are vehicle crashes where the side of one or more vehicles is impacted. These crashes often occur at intersections, in parking lots, and when two vehicles pass on a multi-lane roadway. What object entity has the relation of 'subclass of' with the subject 'head-on collision'? Choices: - aircraft - case - city - collision - concrete - damage - death - distance - driving - engine - english - equipment - french - gravity - lane - machine - motor vehicle - park - parking - pass - people - pole - property - propulsion - rail - road - road vehicle - rope - series - spacecraft - surface - track - traffic - traffic accident - train - transport - truck - vehicle - water - weather - wire
A: traffic accident

Q: Information: - A psychologist is a professional who evaluates and studies behavior and mental processes (see also psychology). Typically, psychologists must have completed a university degree in psychology, which is a master's degree in some countries and a doctorate in others. This definition of psychologist is non-exclusive; in most jurisdictions, members of other professions (such as counselors and psychiatrists) can also evaluate, diagnose, treat, and study mental processes. Some psychologists, such as clinical and counseling psychologists, provide mental health care, and some psychologists, such as social or organizational psychologists conduct research and provide consultation services. - A psychiatrist is a physician who specializes in psychiatry, the branch of medicine devoted to the diagnosis, prevention, study, and treatment of mental disorders. Psychiatrists are medical doctors, unlike psychologists, and must evaluate patients to determine whether their symptoms are the result of a physical illness, a combination of physical and mental ailments, or strictly psychiatric. - Gender dysphoria or gender identity disorder (GID) is the dysphoria (distress) a person experiences as a result of the sex and gender they were assigned at birth. In these cases, the assigned sex and gender do not match the person's gender identity, and the person is transgender. There is evidence suggesting that twins who identify with a gender different from the one they were assigned at birth may do so not just due to psychological or behavioral causes, but also biological ones related to their genetics or exposure to hormones before birth. - Gender dysphoria in children or gender identity disorder in children ( GIDC ) is a formal diagnosis used by psychologists and physicians to describe children who experience significant discontent ( gender dysphoria ) with their biological sex , assigned gender , or both . GIDC was formalized in the third revision of the Diagnostic and Statistical Manual of Mental Disorders ( DSM - III ) in 1980 and primarily referenced gender non-conforming behaviors . GIDC remained in the DSM from 1980 to 2013 , when it was replaced with the diagnosis of '' gender dysphoria '' in the fifth revision ( DSM - 5 ) , in an effort to diminish the stigma attached to gender variance while maintaining a diagnostic route to gender affirming medical interventions such as hormone therapy and surgery . Controversy surrounding the pathologization and treatment of cross-gender identity and behaviors , particularly in children , has been evident in the literature since the 1980s . Proponents argue that therapeutic intervention helps children be more comfortable in their bodies and can prevent adult gender identity disorder . Opponents say that the equivalent therapeutic interventions with gays and lesbians ( titled conversion or reparative therapy ) have been strongly questioned or declared unethical by the American Psychological Association , American Psychiatric Association , American Association of Social Workers and American Academy of Pediatrics . The World Professional Association for Transgender Health ( WPATH ) states that treatment aimed at trying to change a person 's gender identity and expression to become more congruent with sex assigned at birth '' is no longer considered ethical . '' Critics also argue that the GIDC diagnosis and associated therapeutic interventions rely on the assumption that an adult transsexual identity is undesirable , challenging this assumption along with the lack of clinical data to support outcomes and efficacy . Gender identity disorder in children is more heavily linked with adult homosexuality than... What object entity has the relation of 'medical specialty' with the subject 'gender dysphoria in children'? Choices: - genetics - psychiatry
A: psychiatry