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 A, has Bioavailabity of 80% volume of distribution is 10 L, Calculate the loading dose to be given to achieve plasma concentration of 0.6 mg/L 
Select and explain. 
A. 0.75 mg, B. 0.48 mg, C. 7.5 mg, D. 48 mg
C: 7.5 mg
Answer: C: 7.5 mg 
Explanation: None