This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
Dermatological manifest of IBD: 
Select and explain. 
A. Pyoderma gangrenosum, B. Necrolytic migratory erythema, C. Impetigo, D. Psoriasis
A: Pyoderma gangrenosum
Answer: A: Pyoderma gangrenosum 
Explanation: Ans. (a) Pyoderma gangrenosumRef: Sabiston 20th edition, Page 1341* Skin manifests in ulcerative colitis:* Most common erythema nodosum (In 10-15% cases)* Pyoderma gangrenosum (Most common site pretibial region--erythematous plaque)