Anaesthesia All of the following are safety measures to prevent the delivery of hypoxic gas mixture to the patient except – A Location of oxygen valve after the N2O valve B Presence of a PIN index system to prevent wrong attachment of the N2O and oxygen cylinders C Location of a fail-safe valve downstream from the nitrous oxide supply source D All of the above 💡 Explanation All of the following are safety measures to prevent the delivery of hypoxic gas mixture to the patient except – ✓ Correct Answer: B. Presence of a PIN index system to prevent wrong attachment of the N2O and oxygen cylinders