Question:On the xy-coordinate plane, points A and B both lie on the circumference of a circle whose center is O, and the length of AB equals the circle's diameter. If the (x,y) coordinates of O are (2,1) and the (x,y) coordinates of B are (4,6), what are the (x,y) coordinates of A? 

A (3, 3/2) 
B (1, 2/2) 
C (0, -4) 
D (2/2, 1) 
E (-1, -2/2) 

+ Answer
C 

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