This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pediatrics
In a premature baby with convulsion after 2 days of birth, first investigation to be done is: 
Select and explain. 
A. Transcranial USG, B. MRI, C. Skull radiography, D. CT skull
A: Transcranial USG
Answer: A: Transcranial USG 
Explanation: a. Transcranial USG(Ref: Nelson's 20/e p 2831-2856, Ghai 8/e p 557-561)Intracranial hemorrhage can be a common cause for seizures in a preterm neonate, which can be picked up easily on a transcranial USG through the open anterior fontanelle.