<prompt> A 2 year old child has a Mantoux test reading of 12 mm × 12 mm after 48 hours. In this case :Anti TB drugs should be started even if xray chest and haemogram are normalTreatment should be started only if xray chest and haemogram are suggestiveOne should wait till overt sign of TB appearNo treatment is required  <response>: Positive tuberculine test in 2 yrs. old child confirms T.B. 