Research studies focusing on genetic factors in schizophrenia have found that
A. an individual with a schizophrenic identical twin has the highest risk factor (almost 50%) of developing schizophrenia.
B. in family studies of schizophrenia, the genetic influence can be separated from the environmental impact.
C. if one person in a family has a particular subtype of schizophrenia, for example, paranoid, the other family members inherit a predisposition for that subtype only.
D. the more severe a parent's schizophrenic disorder, the less likely the children are to develop it.
Answer: A
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