Question

A box of chocolate has gone missing from the refrigerator. The suspects have been reduced to 4 children. Only one of them is telling the truth.

A : 'I did not take the chocolate.'
B : 'A is lying.'
C : 'B is lying.'
D : 'B took the chocolate.'
Who took the chocolate ?

Answer 1

A took the chocolate. 

Since only of them is telling the truth; it is:
A : 'I did not take the chocolate.'  ------lie
B : 'A is lying.'     -----------------------------truth
C : 'B is lying.'    ------------------------------lie
D : 'B took the chocolate.'  ---------------lie