The first Advocate General of Jharkhand was

Mangalmay Banerjee
Sudhanshu Banerjee
Gautam Banerjee
Parimal Banerjee

The correct answer is: A. Mangalmay Banerjee

Mangalmay Banerjee was the first Advocate General of Jharkhand. He was appointed to the position on 15 November 2000. He is a senior advocate of the Supreme Court of India and has been practicing law for over 30 years. He is a graduate of the University of Calcutta and the National Law School of India University. He is a member of the Bar Council of India and the Jharkhand State Bar Council. He has served as a member of the Law Commission of India and the National Human Rights Commission. He is also a former President of the Supreme Court Bar Association.

Mangalmay Banerjee is a highly respected lawyer and has a wealth of experience in the field of law. He is known for his expertise in constitutional law, administrative law, and criminal law. He is also a strong advocate for the rights of the poor and marginalized. He is a valuable asset to the legal profession and to the state of Jharkhand.

The other options are incorrect because they are not the names of the first Advocate General of Jharkhand.