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After giving birth to a daughter a year ago, a couple planned to have a second baby - specifically a son. However they have welcomed four more daughters. Zhao Yan, 29, gave birth to the quads in April. The family was happy although they had wanted a son, but the cost of the quartet has given them a headache. "In the first two months, diapers cost more than 1,000 yuan, and now they can finish a can of powdered milk in two days!" said Zhao.
How old is the mother?
A. 28
B. 30
C. 29