This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': "True regarding crohn\\'s disease are A/E – \nSelect and explain. \nA. Scleroderma, B. Transmural involvement, C. Cobble stone appearance, D. Skin involvement", 'role': 'user'}, {'content': "Answer: A \nExplanation: The skin involvement in Crohn's disease causes erythema nodosum, scleroderma does not occur in Crohn's disease.\nOther extraintestinal manifestations of Crohn's disease:\n\n\nMigratory polyarthritis \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nUveitis\xa0\nClubbing\xa0\nSacroiliitis\nHepatic pericholangitis\xa0\xa0\xa0\xa0\nRenal stones (uric acid & oxalate)\nAnkylosing spondylitis\nPrimary sclerosing cholangitis", 'role': 'assistant'}]