<prompt> A 14 year old boy with difficulty in walking and behavioural disturbance, recovered from prolonged jaundice recently, has bluish pigmentation over lunula. The next investigation to be done:Nail fold cappillaroscopySlit lamp examinationBiopsy of the pigmented areaAnkle-brachial pressure index  <response>: Neurological involvement Jaundice Azure Nails Bluish discoloration of nails Wilsons disease Dx: Slit lamp examination and 24 hrs urinary copper Rx: for Neurological feature - Tetrathiomolybdate 