Sea saw nystagmus is seen in :
Ans. is 'b' Craniopharyngioma (Ref Parson, 18/e, p 336).In Parson it is given that sea-saw nystagmus occurs due to para chiasmatic masses and the only para chiasmatic mass in the option is craniopharyngioma.
Anterior longitudinal fasiculus
Craniopharyngioma
Medullary lesion
G.B. Syndrome
C.N.S.