<prompt> Best indicator of Endotracheal tube Extubation isTin box indexMinute volumeRespiratory rateNegative inspiratory pressure  <response>: D Negative inspiratory pressure Mechanical function indicators of Extubation:1. FEV10-15 mlKg2. Tidal volume 4-6 mlKg3. FVC IN 1 SEC 10 mlKG4. Negative inspiratory force 20 cm H205. Vital capacity 15 mlKG6. Dead space ventilation or tidal volume ratio 0.67. Rapid shallow breating index 