In addition to financial data, what other types of records can be kept in a blockchain?

The reason an interviewer will ask this type of question is to determine how broad your knowledge of this topic is. In this particular case, most people who are knowledgeable about blockchains tend to focus on financial records and transactions related to Cryptocurrencies. By asking this question, the interviewer is trying to determine if you are aware of other types of blockchains. This is important since the use of Blockchain is expanding into other industries and applications.