This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiopulmonary Resuscitation And Mechanical Ventilation, Subject name: Anaesthesia
[{'content': 'During cardiopulmonary resuscitation, external cardiac compression is given over \nSelect and explain. \nA. Upper third of sternum, B. Mid third of sternum, C. Lower third of sternum, D. Precordium overall', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. c (Lower third of sternum) (Ref. Short text book of Anaesthesia, 2nd ed196)External cardiac massage InfantsChildrenAdultsPulse checkBrachial/ femoralCarotidCarotid/ femoralCompression areaMidsternumMidsternumLower 1/3 rd of sternumCompression with2-3 fingers or by thumbs while chest in encircled by both handsHeel of one handBoth hands, one palm over other and hand should be extended at elbowCompression depth 1/2 -1 inch1- 1/2 inch1 1/2 inchRate100/min100/min100/minRatio of cardiac compression to breathing5:15:130:2UK Resuscitation Council Adult Life Support (ALS) Alorithm -2010', 'role': 'assistant'}]