New Delhi, Apr 12 (ANI): BJP spokesperson Nirmala Sitaraman hits out at Congress Chief Sonia Gandhi on Saturday after former media adviser to Prime Minister, in his book stated that Gandhi undermined Singh’s power. Sanjaya Baru’s book, "The Accidental Prime Minister", was published on Friday. Singh's spokesman dismissed the book as an incorrect interpretation of the prime minister's 10 years in power. Sitaraman, while addressing a news conference demanded an answer from Sonia Gandhi.