<prompt> Which of the following is a feature of pernicious anaemiaGlossitisTingling or numbness of extremitiesNervous system involvement in 75 casesAll of the above  <response>: In pernicious anaemiaTriadGeneralised weaknessSore and painful tongueTingling or numbness of extremitiesNervous system involvement is present in 75 of casesDegeneration of myelin sheath peripheral nerves 