A 27-year-old female patient presents with a history of migraines occurring 2-3 times a week. She is interested in finding a prophylactic medication that can reduce the frequency of her migraines, but is concerned about potential birth defects if she becomes pregnant while taking the medication. Which of the following medications is safe for use in women of child-bearing age and has the lowest risk of causing birth defects?

A. Propranolol

B. Zolmitriptan

C. Topiramate

D. Combined oral contraceptive pill

E. Sumatriptan

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