A patient presents with diplopia with limitation of adduction in the left eye and abducting saccade in the right eye.Convergence is preserved. Most likely etiology is:: (A) Paial 3rd nerve palsy, (B) Internuclear ophthalmoplegia, (C) Duane's reactionary syndrome, (D) Absence of medial rectus muscle
Answer is B. Ans. Internuclear ophthalmoplegia