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: Pharmacology
Drug X is normally administered to patients at a rate of 50 mg/hour. Elimination of the drug X from body takes place as:
– Hepatic Metabolism 10%
– Biliary Secretion 10%
– Renal Excretion 80%
This drug has to be administered to a 65 years old patient Uttaam Singh, with a GFR of 60 ml/min. (assuming normal GFR is 120ml/min). Liver and biliary functions are normal in this patient. What should be the dose rate of drug X in this patient? 
Select and explain. 
A. 50 mg/hour, B. 30 mg/hr, C. 25 mg/hr, D. 100 mg/hr
B: 30 mg/hr
Answer: B: 30 mg/hr 
Explanation: None