This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Anesthesia, Subject name: Anaesthesia
[{'content': 'All true except \nSelect and explain. \nA. Patient on warfarin is contraindicated to LP, B. LMWH should be stopped 24 hours prior to LP, C. IV Heparin should be stopped 6 hours before LP, D. Aspirin is not a contraindication to lumbar puncture', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. IV Heparin should be stopped 6 hours before LPExplanationLow dose aspirin <150 mg per day aspirin is not a contraindication to LP.DrugTime to stop before LPTime after LP to start anticoagulationHeparin2-4 hours2 hoursLMWH24 hours (Therapeutic)4 hoursFondaparinux72 hours12 hoursRivaroxaban72 hours fllHI6 hoursDabigatran120 hours6 hoursApixaban72 hours6 hoursPrasugrel7-10 days6 hoursTicagrelor5-7 days6 hoursClopidogrel7 days2 hours', 'role': 'assistant'}]