A patient presents with a sudden onset of ipsilateral facial drooping, inability to close the eye, and loss of taste sensation on the anterior two-thirds of the tongue, without any other neurological deficits. Which cranial nerve is most likely affected?

The correct answer to the question "A patient presents with a sudden onset of ipsilateral facial drooping, inability to close the eye, and loss of taste sensation on the anterior two-thirds of the tongue, without any other neurological deficits. Which cranial nerve is most likely affected?" is Option B: Facial nerve (CN VII).

The other options — A) Trigeminal nerve (CN V), C) Glossopharyngeal nerve (CN IX), D) Hypoglossal nerve (CN XII) — are incorrect for this USMLE Exam Prep question. As explained above: The facial nerve (CN VII) innervates the muscles of facial expression, provides taste sensation to the anterior two-thirds of the tongue, and controls lacrimal and salivary glands. Unilateral facial …