<prompt> Which drug is indicated for pain related to acute renal calculi?Narcotic analgesicsNonsteroidal anti-inflammatory drugs NSAIDSMuscle relaxantsSalicylates  <response>: Narcotic analgesics are usually needed to relieve the severe pain of renal calculi.Options B and D: NSAIDS and salicylates are used for their anti-inflammatory and antipyretic properties and to treat less severe pain.Option C: Muscle relaxants are typically used to treat skeletal muscle spasms. 