As a general rule, a sentence that begins with noun A and noun B should be followed by a "plural" form of the verb. For example, May and Tom are good students.
However, which verb should be used in the following example?
The diagnosis and management of disease X require/requires an extensive ...
As in the first example, the original sentence can be broken into
May is a good student.
Tom is a good student.
May and Tom are good students.
Following the logic,
The diagnosis of disease X requires .... The management of disease X requires ....
the diagnosis AND management of disease X be followed by
require? Or is there any difference between
the diagnosis and management of disease X and
THE diagnosis and THE management of disease X, in which the subject in the former is considered singular and that in the latter is plural?