Discussion

Explanation:

Since vial A tests positive one of patient 9 to 16 will have the disease.

Now, vials D and G test negative hence, patients 9, 10, 11, 12, 14 and 16 cannot have the disease.

⇒ One of patients 13 or 15 will have the disease.

To check which one of patients 13 or 15 have the disease we need to check a vial which does not have both the samples.

∴ We can check either vial E or F.

Hence, option (c).

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