Picking on an advertisement issued by the Petroleum Ministry to explain the recent fuel price hike, CPI(M) Politburo member and MP Brinda Karat wrote a letter to Petroleum Minister Murli Deora on Tuesday, questioning the Ministry's claim about the Government absorbing a financial burden of over Rs 71,000 crore during the current financial year. "I believe that the claim is not based on facts. In fact, the entire campaign launched by your ministry is misleading,' she said, seeking answers to a five-point questionnaire.