<prompt> In Duchennes muscular dystrophy, which muscle is not involved :GastrocnemiusVastus medialisBrachioradialisInfraspinatus  <response>: Ans. is b d Vastus medialis and infraspinatus Ref. O.P. Ghai, 5e, p 425; Harrison, 17e p 2682, 2683 16e, p 2528 15e, p 2530. 