A triangle can be formed having side lengths 4,5 and 8. It is impossible, however, to construct a triangle with side lengths 4,5 and 10. Using the side lengths 2,3,5,7 and 11, how many different triangles with\:exactly\:two\:equal\:sides can be formed?
Answer Choices
A. 8
B. 5
C. 20
D. 10
E. 14