This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Cardiac septum develops by 
Select and explain. 
A. 5-8 weeks, B. 9-12 weeks, C. 12-16 weeks, D. 16-18 weeks
A: 5-8 weeks
Answer: A: 5-8 weeks 
Explanation: Cardiac septum developed by 5-8 weeks . Ref - sciencedirect.com