A healthy 10-year-old child presented to ER with sudden, severe onset headache, the study of choice that should be done is

Correct Answer: A

Rationale: Cranial CT is the study of choice for sudden, severe headache in the ER, per AAN, to quickly rule out hemorrhage (e.g., SAH) or mass. MRI is detailed but slower; skull X-ray misssoft tissue; EEG seizures; LP risks herniation. CTs speed makes A the correct answer.

Correct Answer: D

Rationale: Ethosuximide is first-choice for absence seizures, per NICE, targeting T-type calcium channels for brief awareness loss with eye fluttering/lip smacking. Fosphenytoin and phenobarbital treat tonic-clonic; valproate broader-spectrum; midazolam acute. Ethosuximidspecificity makes D the correct answer.

Correct Answer: D

Rationale: Poliomyelitis affects anterior horn cells, causing weakness in children, per virology texts, from poliovirus destruction. Guillain-Barré is demyelinating; HMSN peripheral; tick paralysis junctional; Bells facial. Polios spinal targeting makes D the correct answer.

Correct Answer: B

Rationale: IVIG is first-line for Guillain-Barré, per AAN, hastening recovery by neutralizing antibodies. Physiotherapy supports; plasma exchange alternative; drugs and steroids less effective. IVIGs evidence base make B the correct answer.

Correct Answer: D

Rationale: Slow muscle relaxation distinguishmyotonic dystrophy, per neurology, from Duchenne, due to myotonia (delayed relaxation post-contraction). Ptosis , cardiac issu, leg weakness , and facial weakness overlap. Myotonias specificity makes D the correct answer.