This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
A young girl presents with repeated episodes of throbbing occipital headache associated with ataxia and veigo. The family history is positive for similar headaches in her mother. Most likely diagnosis is 
Select and explain. 
A. Vestibular Neuronitis, B. Basilar migraine, C. Cluster headache, D. Tension headache
B: Basilar migraine
Answer: B: Basilar migraine 
Explanation: basilar migraine is a rare type of migraine that begins in the brain stem. A basilar migraine may be caused by a constriction of blood vessels that limit blood flow to the brain. Other conditions that restrict blood flow, such as touous blood vessels, may also cause basilar migraines Ref Harrison20th edition pg 2345