Compare the knowledge of persons X, Y, Z, A, B and C in relation to each other : 1. X knows more than A. 2. Y knows as much as B. 3. Z knows less than C. 4. A knows more than Y. The best knowledgeable person amongst all is :

A. X
B. Y
C. A
D. C
Answer: A . X

Justification: Clearly, we have : A < X, Y = B, Z < C, Z< B, Y< A. Thus, the sequence becomes : X > A > Y = B > C > Z. So, X is the best knowledgeable person.