The concept of 'varna' is first mentioned in the Rigveda, the oldest of the four Vedas, which is a collection of hymns and poems.

The traditional Indian caste system is based on birth, with people being assigned to a particular caste based on the caste of their parents.

Brahmin, Kshatriya, Vaishya, and Shudra are the four traditional Indian castes.

Shudra is the term for the lowest caste in the traditional Indian caste system.

Adi Shankara argued that caste is not based on birth but on one's actions.

The story of the demon king Ravana, who is depicted as having ten heads and twenty arms, is found in the Ramayana.

B.R. Ambedkar argued that the caste system is a social construct that can be changed.

The story of a young woman who is forced to marry a man she does not love is found in the novel Nirmala by Munshi Premchand.

Mehboob Khan made the film 'Mother India', which tells the story of a woman who struggles to raise her children in a patriarchal society.

M.F. Husain is known for his paintings of rural life and social issues.

Munshi Premchand is known for his short stories and novels that explore the lives of marginalized people.

Rabindranath Tagore is known for his poems that celebrate the beauty of nature and the human spirit.

Adi Shankara argued that the ultimate goal of life is to achieve moksha, or liberation from the cycle of birth and rebirth.

Adi Shankara argued that the world is an illusion and that the only reality is Brahman, or the Absolute.

Ramanuja argued that the world is real and that Brahman, or the Absolute, is immanent in the world.