Three of the following four terms represent tissue types or structures derived from a specific embryonic germ layer (ectoderm), while one is different in its primary classification level. Identify the odd one out based on histology classification.

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?