If in triangle ABC , A ≡ (1, 10) , circumcentre ≡(- 1/3, 2/3) and orthocentre ≡ (11/3, 4/3) then the co-ordinates of mid-point of side opposite to A is :
(A) (1, -11/3)
(B) (1, 5)
(C) (1, -3)
(D) (1, 6)