The most accurate description of the basic structure of Ig molecule is
A tetrapeptide chain consisting of 2 heavy chains and 2 light chains
B. A dipeptide chain consisting of 1 heavy chain and 1 light chain
C. A tetrapeptide chain consisting of 2 identical heavy chains and 2 identical light chains
D. A tripeptide chain consisting of 1 heavy chain and 1 light chain
E. A tetrapeptide chain consisting of 4 identical peptide chains