What Term Should Be Added To $y ^ { 2 } - \frac { 1 } { 5 } y$

Multiple Choice

What term should be added to $y ^ { 2 } - \frac { 1 } { 5 } y$ to make it a perfect square trinomial?

A) 5
B) $\frac { 1 } { 100 }$
C) 100
D) $\frac{5}{2}$
E) $\frac { 1 } { 50 }$