Jego siostra została lekarzem.

English Translation

His sister became a doctor.

Since it’s his sister, who is female, shouldn’t this be lekarką?

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Sadly, the feminine profession names aren’t popular, especially in academic and juridical use. Lekarką, profesorką, adwokatką, developerką, budowlanką, etc. It takes a lot of creative power to come up with the right names sometimes. Those forms should be correct. As well as położnik, steward, asystent on the other side of the coin.