<prompt> Which of these muscles is most frequently affected in childhood poliomyelitis?QuadricepsDeltoidTibialis anteriorBiceps  <response>: Ans. A. QuadricepsThe most frequently affected muscles in poliomyelitis in order of the frequency with which they are affectedLower limb muscles - Quadriceps; tibialis anterior; peroneal muscles Upper limb muscles - Deltoid; triceps; biceps Trunk - abdominal muscles; back; intercostals; diaphragm 