April 16 (Reuters) - Canada’s main stock index extended its rise on Friday, following a record high hit a day earlier, as oil and gold prices advanced. * At 9:31 a.m. ET (13:31 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 28.26 points, or 0.15%, at 19,350.18. (Reporting by Shashank Nayar in Bengaluru; Editing by Vinay Dwivedi)