I checked, and "You're gonna need that pure religion" has a verse about a doctor.

ch:
Yr gonna need that pure religion
hallelu
Yr gonna need that pure religion
hallelu
Yr gonna need that pure religion
pure religion take you home to heaven
Yr gonna need that pure religion
hallelu

Mother & father by the bed a cryin
hallelu
Mother & father by the bed a cryin
hallelu
Mother & father by the bed a cryin
Said, Lord have mercy our child is dyin
Yr gonna need that pure religion
hallelu

Doctor standing lookin sad
hallelu
Doctor standin lookin sad
hallelu
Doctor standin lookin sad
Let the lord have mercy our child is dead
Yr gonna need that pure religion
hallelu

chorus

See that train comin round the curve
hallelu
See that train comin round the curve
hallelu
See that train comin round the curve
Now she is strainin every nerve
Yr gonna need that pure religion
hallelu

From Lucinda Williams
"Ramblin"
Smithsonian Folkways 1991 reissue

Nora