An infant is born with a sac protruding through the spine, containing cerebrospinal fluid, a portion of the meninges, and nerve roots. This condition is referred to as:

Choice A reason: Myelomeningocele is a neural tube defect where a sac containing cerebrospinal fluid, meninges, and nerve roots protrudes through a spinal defect. This causes neurological impairments, like paralysis, due to exposed neural tissue, matching the described condition and requiring urgent surgical intervention. Choice B reason: Meningocele involves a sac with cerebrospinal fluid and meninges but no nerve roots, protruding through a spinal defect. It causes fewer neurological deficits than myelomeningocele, as neural tissue is not involved, making it incorrect for the described condition with nerve roots. Choice C reason: Spina bifida occulta is a mild neural tube defect with no protruding sac, only a vertebral gap. It often causes no symptoms, unlike the described condition with a sac containing nerve roots, making this an incorrect diagnosis for the visible defect. Choice D reason: Anencephaly is a severe neural tube defect with absent brain and skull parts, not a spinal sac with cerebrospinal fluid and nerve roots. It is incompatible with life and unrelated to the described spinal condition, making it an incorrect diagnosis.