During assessment of the neurological status of a 6-year-old boy, he was asked to smile, blow out his cheeks, blink forcibly, and furrow his forehead. The cranial nerve that is evaluated by doing the above maneuver is

Correct Answer: D

Rationale: Cranial nerve VII (facial nerve, D) controls smiling, cheek puffing, blinking, and forehead furrowing, per neurologic exams. CN III , IV , and VI govern eye movements; VIII hearing. Facial nerve dysfunction (e.g., Bells palsy) impairs these, making D the correct answer.

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: B

Rationale: Triptans are most useful for severe, unresponsive migraines, per AHS, targeting serotonin receptors to abort attacks. Propranolol and topiramate prevent, not treat acutely; nortriptyline is for chronic pain; cyproheptadine adjunctive. Triptans acute efficacy make B 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.