This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Common primary sites of metastasis to the brain are -a)  Thyroid Cab)  Tongue Cac)  Lung Cad)  Breast Cae)  Ovary Ca 
Select and explain. 
A. acd, B. bcd, C. ad, D. b
A: acd
Answer: A: acd 
Explanation: None