<prompt> Bilateral loss of ankle jerk and extensor plantar response is seen in:Amyotrophic lateral sclerosisFreidrichs ataxiaTabes dorsalisLead poisoning  <response>: Answer is B Friedrichs ataxia: Absent deep tendon reflexes despite coicospinal tract involvement with an extensor plantar reflex is characteristic of Friedrichs ataxia. Disorder Pyramidal tract Posterior column Deep tendon Planter Associations involvement involvement reflexes Neurological Others Friedrichs ataxia Present Present Areflexia Extensor - Wide based - Cardiomyopathy genetic Areflexia despite coicospinal involvement Q ataxia - Nystagmus - Dysahria - Optic atrophy - Skeletal abnormality - Dysmetria - Diabetes mellitus SACD Present Present Exaggerated Extensor Spastic gait Low serum B12 4, B12 usuallyQ may be decreased increased or absent initially ataxic megaloblastic anemia Tabes dorsalis Absent Absent AreflexiaQ Absent Argyll Atonic bladder teiary syphilis Robeson pupil 