Give some stream of consciousness and then the answer. Aditya Puri is the Managing Director of HDFC Bank, India's largest private sector bank. He assumed this position in September 1994, making him the longest-serving head of any private bank in the country. India Today magazine ranked him # 24th in India's 50 Most Powerful People of 2017 list.

Answer this question: who is the managing director of hdfc bank?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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To answer the above question, the relevant sentence is: Aditya Puri is the Managing Director of HDFC Bank, India's largest private sector bank.
Therefore, the answer is Aditya Puri.