The acute angles of a right triangle are a^{\circ} and b^{\circ}, where a>b and both a and b are prime numbers. What is the least possible value of b ?

**Answer Choices**

A. 2

B. 3

C. 5

D. 7

E. 11

The acute angles of a right triangle are a^{\circ} and b^{\circ}, where a>b and both a and b are prime numbers. What is the least possible value of b ?

**Answer Choices**

A. 2

B. 3

C. 5

D. 7

E. 11