This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Rains factor is used for measurement of blood loss in operations or minor procedures . It is \nSelect and explain. \nA. Total difference in swab weight x 0.5, B. Total difference in swab weight x 1.5, C. Total difference in swab weight x 2.5, D. None of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Rains factor Total amount of blood loss = Total difference in swab weight x 1.5 Or Total difference in swab weight x 2 (for larger wounds or operations ) Ref : Srb's manual of surgery p/ 120", 'role': 'assistant'}]