Which of the following statem ents with regard to ulcerative colitis is most factually correct?

A、 FBC and inflammatory markers w ithin the normal range almost always exclude a Diagnosis of ulcerative colit is
B、 Growth failure is a common presentation of ulcerative colitis and often precedes GI Sympt oms by mont hs or even years
C、 Half the patients presenting with u lcerative colitis p resent w ith classic colitic Sympt oms of abdominal pain and bloody diarrhoea
D、 The pANCA b lood tests are positive in 15% of cases o f ulcerative colitis and 45% of Cases of Crohn disease
E、 Ulcerative colitis is more common than Crohn disease in younger children and in Asian chi ldren