This passage about the Swedish fika appeared in an English exam in Taiwan:
Surprisingly, many Swedish companies insist that their employees take two fika breaks during the workday. This often equates to one fika break in the morning and _____ in the afternoon.
The answer given was "the other", the reason being that the two fika breaks have been mentioned in the first sentence so we should use "the other" to point specifically to "the other fika break". I chose "another", though, because it sounded more natural. (I've always relied on intuition rather than any grammar rules)
Is it a grammatical error to use "another" here? Which choice sounds more natural to you?