Statements related to human insulin are given below. Which statement(s) is/are correct about genetically engineered insulin?
(a) Pro-hormone insulin contain extra stretch of C-peptide
(b) A-peptide and B-peptide chains of insulin were produced by creating disulphide bond between them.
(c) insulin used fro treating Diabetes was extracted from cattles and pigs.
(d) pro-hormone insulin needs to be processed for converting into a mature and functional hormone
(e) some patients develop allergic reactions to the foreign insulin.
choose the most appropriate answer from the options given below :

Options

A. (a),(b) and (d) only
B. (b) only
C. (c) and (d) only
D. (c),(d) and (e) only