Instructions: Given a travel related situation, and given a specific question about the situation, summarize the question into a title
Input: Besides the Turkish Lira, can I use US dollars and/or Euros in Istanbul?

I mean particularly for paying in taxis, groceries and vegetable markets.

If this is possible, is there any additional cost for this? I.e. will I pay more if I pay to a taxi driver in US dollars?

Output:
What currencies can I use in Istanbul?