A CDAI is a multi-item instrument which measures severity of active Crohn's Disease monitored over 7 days includes subject reported symptoms, physician-assessed signs, and laboratory markers. CDAI score = Sum of weighted scores for subjective items (number of liquid/soft stools, degree of abdominal pain, general well-being); and objective items (associated signs, use of anti-diarrhoeal medication, abdominal mass, haematocrit, daily morning temperature, body weight). CDAI scores range approximately from 0 to 600, higher scores indicating greater disease activity. The CDAI response at Week 8 is defined as either CDAI score of less than (\<)150 or CDAI reduction from baseline of at least 100 points, where baseline was last non-missing observation prior to first administration of the study drug. Modified Intent-to-treat (mITT)population was analysed for this end point, which included all subjects who were randomized and received at least 1 dose of study drug in double-blind period.