The presence of two or more disorders in the same individual is called comorbidity. The Option B is correct.
In medicine, the term comorbidity mean presence of one or more additional conditions often co-occurring (concomitant or concurrent) with a primary condition. It also describes the effect of all other conditions an individual patient might have other than primary condition of interest, and can be physiological or psychological.
In context of mental health, comorbidity means the disorders that are often coexistent with each other, such as depression and anxiety disorders. However, the concept of multimorbidity is related to comorbidity but presents a different meaning and approach.
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