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Which sentence is punctuated correctly? A. I understand that Dr Elliott earned his M.D. at Columbia University. B. I understand that Dr. Elliott earned his M.D. at Columbia University. C. I understand that Dr, Elliott earned his MD at Columbia University.

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"B. I understand that Dr. Elliott earned his M.D. at Columbia University" has correct punctuation since these are all proper titles, although it's not uncommon to see "MD" without periods.
User Alexei Burmistrov
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