This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Basic amino acids are 
Select and explain. 
A. Lysine and Arginine, B. Serine and cystein, C. Phenylalanine and Tyrosine, D. Aspartic acid and Glutamic acid
A: Lysine and Arginine
Answer: A: Lysine and Arginine 
Explanation: (Lysine and Arginine) (47- U.Satyanarayan 3rd)Classification of Amino acids1.Amino acid with aliphatic side chains - Glycine, Alanine, valine, leucine and Isoleucine2.Hydroxyl group containing amino acids- Serine, threonine and tyrosine3.Sulfur containing amino acids - cysteine, methionine4.Acidic ami noacids - Aspartic acid, glutamic acid5.Basic amino acids - Lysine, arginine, histidine6.Aromatic amino acids - Phenyl alanine, tyrosine and tryptophan7.Imino acids - Proline