Semi essential amino acids are:
B
aspartic acid and histidine
D
aspartic acid and arginine
Correct option is B. arginine and histidine
Hopkins determined animals cannot synthesize seven amino acids. They are called essential amino acids (lysine, methionine, leucine, isoleucine, valine, tryptophan, and phenylalanine). In human beings, essential amino acids are eight in number (additional threonine). $$\text{Arginine and histidine are semi-indispensable because they are slow to be formed}$$$$\text{in humans.}$$
Option D is correct.