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Pellagra should be suspected whenever tuberculous patients under treatment with isoniazid develop mental , neurological or gastrointestinal symptoms , even in the absence of typical pellagra dermatitis .
 mental , neurological or gastrointestinal symptoms, isoniazid
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 mental , neurological or gastrointestinal symptoms, isoniazid