Mirroring weakness for the fifth straight day, the benchmark BSE Sensex on Friday went down over 181 points to end the day at 26,656.83 a one-month low - after lacklustre results from l&T and ITC rekindled worries over the financial health of India Inc. The Nifty too struggled to break free, which closed below the 8,100-mark weighed down by losses in heavyweights. ITC figured in the list of worst performers as it sank over 4 per cent after its quarterly numbers failed to move investors. The FMCG major posted a marginal rise in standalone net profit at `2,431.25 crore for the September quarter.