Reverse Cold Chain is used for -
Ans. is 'a' i.e., Carrying stool samples of polio patients from MC to lab "Reverse cold chain" is for transpo of ble poliovirus in stool to an investigation centre.
Carrying stool samples of polio patiens from a PHC to the lab
Transpoing outdated vaccines from PHC to district hospital
Transpoing vaccines to lab. to check its potency
Transpoing vaccine form camps to sub - centre