This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which drug is indicated for pain related to acute renal calculi? 
Select and explain. 
A. Narcotic analgesics, B. Nonsteroidal anti-inflammatory drugs (NSAIDS), C. Muscle relaxants, D. Salicylates
A: Narcotic analgesics
Answer: A: Narcotic analgesics 
Explanation: 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.