<prompt> In a 6-year-child with ALL relapse, most common site:Bone marrowLiverTestesLung  <response>: a. Bone marrowRef: Nelsons 20e p 2439-2441, Ghai 8e p 599Infants with ALL, and patients with t4;11, have a higher risk of relapse despite intensive therapyHigher levels of MRD 0.01 present at end of induction suggest a poorer prognosisRelapse occurs in the bone marrow in 15-20 of patients with ALL and carries the most serious implications 