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: Dental
[{'content': 'Pyoderma gangrenosum is seen in – a) Crohms diseaseb) Divertuculosisc) Ulcerative colitisd) Ca. colon \nSelect and explain. \nA. a, B. ac, C. ad, D. b', 'role': 'user'}, {'content': "Answer: B \nExplanation: Pyoderma gangrenosum is characterized by rapidly spreading ulcer with erythematous, infiltrated border on thighs and abdomen. It is associated with several internal diseases such as ulcerative colitis, Crohn's disease, biliary cirrhosis, SLE, RA, CML.", 'role': 'assistant'}]