Task: Question Answering
Input (English): Problem: the points a ( 0, 0 ), b ( 0, 4 a - 5 ) and c ( 2 a + 1, 2 a + 5 ) form a triangle. if angle abc = 90, what is the area of triangle abc ?
Options: a. 80, b. 82.5, c. 78.5, d. 75.5, e. 74
Output (English): b