A patient with suspected subarachnoid haemorrhage presents with blood isolated in the fourth ventricle on a CT scan. Aneurysmal rupture is likely to have resulted from -: (A) Posterior Inferior Cerebellar Artery Aneurysm, (B) Anterior Communicating Artery Aneurysm, (C) Posterior Communicating Artery Aneurysm, (D) Basilar Artery Tip Aneurysm
Answer is A. None