Step 1: About NCPCR. The National Commission for Protection of Child Rights was set up under the Commissions for Protection of Child Rights Act, 2005.
Step 2: First chairperson. Shantha Sinha, a noted child rights activist and Ramon Magsaysay awardee, became the first Chairperson of NCPCR in 2007.
Step 3: Eliminate other options.
- Yashwant Jain → Member of NCPCR, not Chairman.
- Amod Kanth → Worked in child welfare NGOs but not NCPCR head.
- Nina Nayak → Vice-Chairperson, not Chairperson.
Step 4: Conclude. Hence, the correct answer is Shantha Sinha.
\[
\boxed{\text{Shantha Sinha}}
\]