The direct object is “patient” in the given sentence because the remaining words such as “helped” are described as “verb”.
The subject is “nurse” used in this sentence, who has given medication.
Thus, the options (a), (d) and (b) are incorrect.
The direct object is “patient” in the given sentence because the remaining words such as “helped” are described as “verb”.
Therefore, the correct option is – c. patient.