This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Recombinant human insulin is made by - 
Select and explain. 
A. CDNA from any eukaryote cell, B. Genome of any eukaryote, C. CDNA of pancreatic cell, D. Genome of pancreatic cell
C: CDNA of pancreatic cell
Answer: C: CDNA of pancreatic cell 
Explanation: Ans is option 3- CDNA of pancreatic cell. Ref Harrison 19 /2402,2411