People who understand hindi please answer soon ls no. 1 chandni raat

स्वमत :-

‘प्रकृति मनुष्‍य की मित्र है, स्‍पष्‍ट कीजिये'
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Which source would provide the most bias-free information about smoking and increased health risks? a) a website created by heart disease patients b) a research study conducted by the mayo clinic eliminate c) a public service message sponsored by tobacco companies d) an online question forum conducted by attorneys for cardiac specialists