Who amongst A, B, C, D and E is the tallest?
I. A is taller than B. E is not the tallest.
II. C is taller than A. D is not the tallest.
If the data in both statements I and II together are necessary to answer the question.
It is clear that neither of the statements alone is sufficient. From Statement I and II, C > A > B and E and D are not the tallest. Hence, C is the tallest. So, both Statements I and II are required to answer the question.