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Option 1 : Drug addiction is possibly linked to genetics.
Option 1 is correct as it is mentioned that it is true 'even if the children are separated from their parents at birth'. It means that there is a connection on some level, between drug addiction and genetics. Option 2 is an assumption that cannot be concluded from the paragraph given. Option 3 is also an invalid conclusion, as nowhere in the paragraph is anything about the treatment of the disease, mentioned.
Hence, option 1 is correct.
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