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
Neural tube formation occurs on 
Select and explain. 
A. 18 to 23 days post fertilization and is the second stage of craniofacial development, B. 28 to 38 days post fertilization and is the third stage of craniofacial development, C. 42 to 55 days post fertilization and is the fourth stage of craniofacial development, D. 17th day post fertilization and is the first stage of craniofacial development
A: 18 to 23 days post fertilization and is the second stage of craniofacial development
Answer: A: 18 to 23 days post fertilization and is the second stage of craniofacial development 
Explanation: None