What relationship did Mileva Maric and Einstein later have?

Correct answer: Husband and wife

The governing concept is recognizing a significant relationship in Einstein’s personal biography. Mileva Maric was first his fellow student at Zurich Polytechnic and later became his wife. Hence option A is correct. The other choices describe relationships that the chapter does not establish: they were not siblings, one was not the other’s teacher, and their connection was not medical. The sequence matters: their relationship developed from shared academic life into marriage. Remembering both facts together—classmates at Zurich Polytechnic and later husband and wife—helps avoid confusing this detail with other people connected with Einstein’s education or professional career.