<prompt> A boy presented with weakness in lower limbs, calf hyperophy, positive Gowers sign and an elevated CPK value of 10,000. The most likely diagnosis is:Duchenne Muscular DystrophySpinal Muscular AtrophyMyotonia congenitaMyotonic Dystrophy  <response>: A male child presenting with lower limb weakness, calf hyperophy, Postive Gowers sign associated with high levels of CPK suggests the diagnosis of DMD. Ref: Essential of Pediatrics By O P Ghai, 6th Edition, Page 547-548 