This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following methods is most suited to assess function of a gene -a) Southern blotb) Nothern blotc) Gene knockout animalsd) Transgenic animals 
Select and explain. 
A. ab, B. bc, C. cd, D. ad
C: cd
Answer: C: cd 
Explanation: Transgenic mice and Knockout mice (animals) are specific genetic approaches to assess the function of gene.