The National Aids Control Organisation (NACO) has certified that West Bengal is number one in preventing parent-to-child transmission of HIV, Chief Minister Mamata Banerjee said on Friday.In a tweet on the occasion of HIV Vaccine Awareness Day, Banerjee said "I am proud to say that the central agency NACO has certified Bengal as number 1 in preventing parent-to-child transmission of human immunodeficiency virus."In another tweet, Banerjee affirmed her government's commitment in preserving the history and culture of the state through museums and collections."On International Museum Day today (Friday), we reiterate our government's commitment in preserving the history and culture of the state through museums and collections," she tweeted.