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
Major pa of cardiac septa development is completed by day: 
Select and explain. 
A. 25, B. 27, C. 35, D. 37
D: 37
Answer: D: 37 
Explanation: The major septa of the hea are formed between the 27th and 37th days of development, when the embryo grows in length from 5 mm to approximately 16 to 17 mm. Ref: Langman's embryology 11th edition Chapter 12.