This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': "Battle's sign is presented in: \nSelect and explain. \nA. Anterior cranial fossa fracture, B. Middle cranial fossa fracture, C. Posterior cranial fossa fracture, D. Fracture lesser wing of sphenoid", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Skull base is formed by Anterior cranial fossa Middle cranial fossa Posterior cranial fossa - Formed by frontal bone - Formed temporal & sphenoid bone - Formed by occipital bone Cribriform plate: Sieve like structure between anterior cranial fossa & nasal cavity Anterior cranial Fossa fracture Middle cranial fossa fracture Posterior cranial fossa fracture - MC type of skull base fracture - Caused by fracture of cribriform plate Clinical feature: - Subconjunctival hematoma - CSF rhinorrhea - Epistaxis - Peritoneal hematoma or "Raccoon eyes" - Carotico cavernous fistula - Frontal lobe contusion - Caused by fracture of petrous pa of temporal bone Clinical feature: - CSF otorrhea - Paradoxical rhinorrhea - Hemotympanum Battle sign: Bruising or ecchymosis behind ear - Ossicular disruption - VII & VIII cranial nerve palsies - Temporal lobe contusion - Caused by fracture of occipital bone Clinical features: - Visual disturbances - VI cranial nerve injury - Jugular foramen syndrome (Vernet syndrome): Paresis of IX, X, XI cranial nerves - Basilar aery injury - Occipital contusion', 'role': 'assistant'}]