This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Defect seen due to failure of closure of rostral part of neural tube or cranial neuropore? 
Select and explain. 
A. Anencephaly, B. Spina bifida, C. Meningocele, D. Sacrococcygeal teratoma
A: Anencephaly
Answer: A: Anencephaly 
Explanation: Ans. A. AnencephalyAnencephaly is the absence of a major portion of the brain, skull, and scalp that occurs during embryonic development. It is a cephalic disorder that results from a neural tube defect that occurs when the rostral (head) end of the neural tube fails to close, usually between the 23rd and 26th day following conception.