How has research on comorbidity changed the focus of epidemiological research?

Question

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Comorbidity research has highlighted the fact that many individuals with mental health problems have multiple disorders, with overlapping symptoms and functional impairments. This has shifted the focus of epidemiological research from simply counting the number of people with a specific disorder (or disorders) to understanding the complexity of mental health problems and the functional impairments associated with them.

Answer: A
 There is some evidence to suggest that comorbidity research has shifted the focus of epidemiological research away from the most severe psychotic disorders and towards milder disorders that affect a larger proportion of the population. This reflects the fact that comorbidity is particularly prevalent in milder disorders such as anxiety and depression, and that these disorders often have a greater impact on people's lives than more severe but less common psychotic disorders.

Answer: D
 Although there is some evidence to suggest that comorbidity research has shifted the focus of epidemiological research away from severe psychotic disorders and towards milder disorders with a greater impact on functional impairment, the identification of biological factors associated with mental disorders has led to a greater emphasis on genetic research. This is particularly the case for disorders such as schizophrenia, where there is strong evidence to suggest that genetic factors play a key role in the development of the disorder.

How Has Research on Comorbidity Changed the Focus of Epidemiological