True regarding Crohn's disease are all except: (A) Scleroderma, (B) Transmural involvement, (C) Cobble stone appearance, (D) Skin involvement
Answer is A. The skin involvement in Crohn's disease causes erythema nodosum, scleroderma does not occur in Crohn's disease.

Other extraintestinal manifestations of Crohn's disease:
1. Migratory polyarthritis           
2. Sacroiliitis 
3. Ankylosing spondylitis    
4. Uveitis
5.. Hepatic pericholangitis        
6. Primary sclerosing cholangitis
7. Clubbing