In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in the blanks.
Blood transfusion is a procedure that starts with the doctor (1) _______ the patients’ blood type. In case of a wrong transfusion in the immune (2) _______ of an individual, it leads to an infection.

Correct option is C

The correct option to fill in the blank is (c) determining; system.
‘Determining’ means finding out or establishing exactly (निर्धारित करना/पता लगाना), which is precisely what a doctor does with a patient’s blood type before transfusion. ‘Immune system’ (प्रतिरक्षा प्रणाली) is the correct biological term; ‘system’ names the whole network of organs and cells responsible for immunity.
Example: The lab first determines the patient’s blood group to ensure compatibility with the immune system requirements.
Explain why other options are incorrect.
· (a) diagnosing; structure: Diagnosing (निदान करना) is used for identifying a disease, not for identifying blood group; structure (संरचना) is the arrangement/parts, not the body’s defense network.
· (b) treating; process: Treating (उपचार करना) means giving therapy; here the action is ascertaining the blood type. Process (प्रक्रिया) is a series of steps, not the name of the body’s defense system.
· (d) settling; order: Settling (सुलझाना/स्थिर करना) doesn’t fit the technical action; order (क्रम/आदेश) is unrelated to immunity.