NEW DELHI (Reuters) - India's retail inflation rate slightly picked up to 3.77 percent in September, government data showed on Friday, driven by higher food and fuel prices and a depreciating rupee.

Analysts polled by Reuters had forecast September's annual increase in the consumer price index at 4.0 percent, compared with August's 3.69 percent.

(Reporting by Manoj Kumar; Editing by Subhranshu Sahu)

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