Thermometric liquid used in clinical thermometerA. MercuryB. AlcoholC. Both (1) and (2)D. None of the above

The correct answer is A. Mercury.

Mercury is the thermometric liquid used in clinical thermometers due to its several advantages. It remains a liquid over a large range of temperatures, it does not stick to the glass, it expands uniformly with temperature, and it is easily visible.

Alcohol, while also used in some thermometers, is not typically used in clinical thermometers because it freezes at a higher temperature than mercury, making it less useful for measuring very low body temperatures.