Given the question: Information: - Dmitri Aleksandrovich Prigov ( Russian : , 5 November 1940 in Moscow -- 16 July 2007 in Moscow ) was a Russian writer and artist . Prigov was a dissident during the era of the Soviet Union and was briefly sent to a psychiatric hospital in 1986 . - Schizophrenia is a mental disorder characterized by abnormal social behavior and failure to understand what is real. Common symptoms include false beliefs, unclear or confused thinking, hearing voices that others do not, reduced social engagement and emotional expression, and a lack of motivation. People with schizophrenia often have additional mental health problems such as anxiety disorders, major depressive illness, or substance use disorders. Symptoms typically come on gradually, begin in young adulthood, and last a long time. The causes of schizophrenia include environmental and genetic factors. Possible environmental factors include being raised in a city, cannabis use, certain infections, parental age, and poor nutrition during pregnancy. Genetic factors include a variety of common and rare genetic variants. Diagnosis is based on observed behavior, the person's reported experiences, and reports of others familiar with the person. During diagnosis a person's culture must also be taken into account. As of 2013 there is no objective test. Schizophrenia does not imply a "split personality" or "multiple personality disorder"conditions with which it is often confused in public perception. The mainstay of treatment is antipsychotic medication, along with counselling, job training, and social rehabilitation. It is unclear whether typical or atypical antipsychotics are better. In those who do not improve with other antipsychotics clozapine may be tried. In more serious situationswhere there is risk to self or othersinvoluntary hospitalization may be necessary, although hospital stays are now shorter and less frequent than they once were. About 0.30.7% of people are affected by schizophrenia during their lifetimes. In 2013 there were estimated to be 23.6 million cases globally. Males are more often affected than females. About 20% of people do well, and a few recover completely. Social problems, such as long-term unemployment, poverty, and homelessness are common. The average life expectancy of people with the... - Bipolar disorder, also known as manic depression, is a mental disorder with periods of depression and periods of elevated mood. The elevated mood is significant and is known as mania or hypomania, depending on its severity, or whether symptoms of psychosis are present. During mania, an individual behaves or feels abnormally energetic, happy, or irritable. Individuals often make poorly thought out decisions with little regard to the consequences. The need for sleep is usually reduced during manic phases. During periods of depression, there may be crying, a negative outlook on life, and poor eye contact with others. The risk of suicide among those with the illness is high at greater than 6 percent over 20 years, while self-harm occurs in 3040 percent. Other mental health issues such as anxiety disorders and substance use disorder are commonly associated. The causes are not clearly understood, but both environmental and genetic factors play a role. Many genes of small effect contribute to risk. Environmental factors include a history of childhood abuse, and long-term stress. The condition is divided into bipolar I disorder if there is at least one manic episode and bipolar II disorder if there are at least one hypomanic episode and one major depressive episode. In those with less severe symptoms of a prolonged duration, the condition cyclothymic disorder may be diagnosed. If due to drugs or medical problems, it is classified separately. Other conditions that may present in a similar manner include attention deficit hyperactivity disorder, personality disorders, schizophrenia, and substance use disorder as well as a number of medical conditions. Medical testing is not required for a diagnosis, though blood tests or medical imaging can be done to rule out other problems. Treatment commonly includes psychotherapy, as well as medications such as mood stabilizers and antipsychotics. Examples of mood stabilizers that are commonly used include lithium and various anticonvulsants. Treatment in a hospital without the... - A hospital is a health care institution providing patient treatment with specialized medical and nursing staff and medical equipment. The best-known type of hospital is the general hospital, which typically has an emergency department to treat urgent health problems ranging from fire and accident victims to a heart attack. A district hospital typically is the major health care facility in its region, with large numbers of beds for intensive care and additional beds for patients who need long-term care. Specialised hospitals include trauma centres, rehabilitation hospitals, children's hospitals, seniors' (geriatric) hospitals, and hospitals for dealing with specific medical needs such as psychiatric treatment (see psychiatric hospital) and certain disease categories. Specialised hospitals can help reduce health care costs compared to general hospitals. - Psychiatric hospitals, also known as mental hospitals and mental asylums, are hospitals or wards specializing in the treatment of serious psychiatric illnesses, such as clinical depression, schizophrenia, and bipolar disorder. Psychiatric hospitals vary widely in their size and grading. Some hospitals may specialize only in short-term or outpatient therapy for low-risk patients. Others may specialize in the temporary or permanent care of residents who, as a result of a psychological disorder, require routine assistance, treatment, or a specialized and controlled environment. Patients are often admitted on a voluntary basis, but people whom psychiatrists believe may pose a significant danger to themselves or others may be subject to involuntary commitment. Psychiatric hospitals may also be referred to as psychiatric wards (or "psych" wards) when they are a subunit of a regular hospital. Given the information above, choose from the list below the object entity that exhibits the relation 'manner of death' with the subject 'dmitri prigov'. Choices: - accident - disease - natural causes - suicide
The answer is:
natural causes