A large chunk of tissue at 35°C with a thermal diffusivity of 1×10-7 m2/s is dropped into iced water. The water is well-stirred so that the surface temperature of the tissue drops to 0°C at time zero and remains at 0°C at all times. The temperature of the tissue after 4 minutes at a depth of 1 cm is
(a) 5°C
(b) 30°C
(c) 25°C
(d) 20°C
(e) 10°C
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