This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
Most Basic amino acid is 
Select and explain. 
A. Lecuine, B. Istidine, C. Arginine, D. Glutamic acid
C: Arginine
Answer: C: Arginine 
Explanation: (C) Arginine # Aminoacid can be acidic, basic or neutral depending up on their side chain.> The lower the Pka of the R gp, the more acidic will be the amino acids, so aminoacid with the highest Pka of the RGP will be most basic.Basic Amino AcidPka of 'R' group* Arginine12.5* Lysine10.8* Histidine6.0