Which problem reported by a client taking lovastatin requires the most immediate follow-up by the nurse?

A. Abdominal cramps may occur with lovastatin but are generally not serious and do not require immediate intervention. They can often be managed with dietary changes or over-the-counter medications. B. Diarrhea and flatulence are common side effects that, while uncomfortable, are not typically life-threatening and do not warrant urgent follow-up. C. Muscle pain, or myopathy, is a significant side effect of lovastatin that can lead to serious complications such as rhabdomyolysis. This condition can cause kidney damage, so any report of muscle pain in a patient taking lovastatin requires immediate follow-up. D. Altered taste is not a serious side effect and usually does not necessitate urgent intervention, although it may be bothersome to the patient.