Answer- A
IIT Madras scientists have developed a low-cost and transportable 3D paper device that can detect milk adulteration in only 30 seconds.
The device is distinct from conventional lab-based techniques and can be employed at home with just one milliliter of milk.
It can recognize numerous frequently employed adulterants, such as detergents, soap, hydrogen peroxide, urea, starch, salt, and sodium-hydrogen-carbonate.