Which physicist and human-rights activist, the 'father of the Soviet hydrogen bomb', won the 1975 Nobel Peace Prize for his opposition to nuclear testing?

• A Igor Kurchatov
• B Andrei Sakharov ✓
• C Yakov Zeldovich
• D Lev Landau

Andrei Sakharov played a key role in developing the thermonuclear weapon but became an outspoken dissident, leading to internal exile in Gorky from 1980 to 1986.