Q: 137 (IAS/1998)

Which one of the following satisfies the relationship D d a : a D D : : R r b : ?
question_subject: 
Logic/Reasoning
question_year: 
1998
question_exam: 
IAS
question_sub_subject: 
Reasoning
question_topic: 
Analytical
stats: 
0,248,56,24,16,248,16