Most trusted brand

in India is Good Knight. Yes, the mosquito repellent brand. Not toothpaste, soft drink or a car or the cricket team.

(Incidentally, in Turkey, it is a football club and a dairy in Argentina and the state owned mobile phone service in China)

In hindsight it seems very likely in India, since the chances that a mosquito repellent brand touches more lives than any single brand of milk or car or toothpaste or mobile brand (and does so effectively).