<prompt> Defect seen due to failure of closure of rostral part of neural tube or cranial neuropore?AnencephalySpina bifidaMeningoceleSacrococcygeal teratoma  <response>: 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. 