<prompt> What is defined as recovery index of the neuromuscular blocker NMB:-It is time interval between 25 and 75 twitch height of the NMBIt is time interval between 25 and 50 twitch height of the NMBIt is time interval between 50 and 75 twitch height of the NMBIt is time interval to reach 100 of twitch height of the NMB  <response>: Duration of action is the time from injection of the neuromuscular blocking agent to return of 25 twitch height. Recovery index is the time interval between 25 and 75 twitch height. 