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One possible approach to determine the return type dynamically based on the argument given is to use a conditional statement or a switch-case statement to check the type of the argument at runtime, and then return the appropriate type accordingly.

For example, in Python, you could use the type() built-in function to determine the type of the argument, and then return a value of the same type using a conditional statement:

def dynamic_return(arg):
    if isinstance(arg, int):
        return 0
    elif isinstance(arg, str):
        return ""
    elif isinstance(arg, float):
        return 0.0
    else:
        return None

In this example, the function takes an argument arg, checks its type using the isinstance() function, and returns a value of the corresponding type (int, str, float, or None).

Note that this approach has certain limitations, such as the need to explicitly check each possible type of argument, and the fact that it might not be able to handle more complex cases where the return type depends on the value of the argument, or on other factors such as context or configuration.