True (2nd law of thermodynamics)
Explanation:
The 2nd law of thermodynamics has many different formulation, but in one of them it says that heat always flows naturally from an object with a higher temperature to an object with lower temperature; it can never flow in the opposite way naturally.
Of course, this does not mean that heat cannot flow from an object at lower temperature to an object at higher temperature: in fact, this can occur only if external work is done on the system. This is what occurs in a refrigerator: thanks to the work done by the motor of the refrigerator, heat is removed from the internal of the refrigerator (which is an environment at lower temperature) and it is given off to the environment (which is at higher temperature). All of this can be done if external work is done on the system: otherwise, this would not occur naturally.
Another way in which the 2nd law of thermodynamics can be expressed is the following: the entropy (the degree of randomness) of an isolated system can never decrease. This means that an isolated system (=no exchange of energy with the surroundings) cannot go from a state at higher entropy (=higher temperature) to a state at lower entropy (=lower temperature) spontaneously.
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