Final answer:
The size a Nitro Cold Brew is served in can be specific to a coffee shop's policy, and without a direct reference, the true/false nature of the statement cannot be confirmed.
Step-by-step explanation:
The statement that a Nitro Cold Brew over ice is served in the medium cup unless requested otherwise is most likely a policy specific to a particular coffee shop or chain, such as Starbucks. While this specific statement appears to reference a standard serving practice, the details of beverage serving sizes can vary by location and company.
Generally, Starbucks refers to its medium size as 'Grande', which is a 16-ounce cup. Comparatively, listed beverage options such as Starbuck's Grande Coffee, Full Throttle, and Monster Energy are mentioned with their respective volumes, but these do not provide direct information about the serving practices for Nitro Cold Brew.