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: Anatomy
[{'content': 'Nodal and lefty2 gene is associated with: \nSelect and explain. \nA. Cardiac looping, B. Intestinal loopin, C. Cardiac septation, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Cardiac looping is dependent in pa upon the laterality-inducing genes nodal and lefty2 Ref: Langman's embryology 11th edition Chapter 12.", 'role': 'assistant'}]