The title "Mr. President" (m.) or Madam President (f.) may apply to a person holding the title of president, or presiding over certain other governmental bodies.

Answer this question: what is the official title of the president of the united states? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: The title "Mr. President" (m.) or Madam President (f.) may apply to a person holding the title of president, or presiding over certain other governmental bodies.
So, the final answer is '' Mr. President '' ( m . ) or Madam President ( f . ).