A 43-year-old with suspected CAP has a negative procalcitonin at presentation but meets clinical and radiographic criteria for bacterial CAP. What is the role of procalcitonin in initial antibiotic decisions?AA negative procalcitonin rules out bacterial CAP; withhold antibioticsBUse procalcitonin to decide initial antibiotics in all casesCDo not use procalcitonin to withhold initial antibiotics when clinical diagnosis of CAP is establishedDStart antivirals onlyEUse procalcitonin threshold >0.5 ng/mL to diagnose CAPCheck my answer