Bunuel
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital
did.
(a) did
(b) are
(c) will be
(d) do
(e) were
(a)
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital did. - "Hospital is designed" and "Hospitals did" are not parallel
(b)
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital are. - "Hospital is designed" and "hospitals are" are parallel. Works well!
(c)
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital will be. - "Hospitals will be" is not the correct form of the tense here. "But in reality" and the context of the sentence suggest that the tense has to be simple present
(d)
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital do. - "Hospital is designed" and "Hospitals do" are not parallel
(e)
In theory, a hospital is designed as per disease pathways, but, in reality, only some hospitals such as Arvind Eye Hospital were. - "Were" is the incorrect form of the verb. We need to use simple present tense