When it comes to careers in healthcare, it is not true that B.A doctor cannot focus on treating a specific disease or injury type.
Doctors are allowed to specialize in whatever medical field they want to so long as they acquire the requisite training. As a result, doctors can indeed focus on treating a specific disease or injury type.
Some of examples include:
In conclusion, it is not true that a doctor cannot specialize in a particular field that allows them to treat specific diseases or injuries.
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