Identify the correct statements.

(a) At present, 30 recombinant therapeutics have been approved world-wide, 12 of these are marketed in India.

(b) Polymerase Chain Reaction (PCR) is now routinely used to detect HIV in suspected AIDS patients.

(c) In mammals (including human) insulin is synthesised as a pro-hormone, which contains A, B polypeptide chains and without extra C- peptide.

(d) Severe Combined Immunodeficiency (SCID) disorder is due to the deletion of the gene for adenosine deaminase.

(e) Currently, monkeys are becoming increasingly preferred over transgenic mice for vaccine safety testing.

Choose the correct answer from the options given below.