Identify the medieval Bhakti movement saint from Maharashtra who played a prominent role in the Varkari sect.

The correct answer is Tukaram.

Explanation and Detailed Analysis:

1. Saint Tukaram and the Varkari Tradition:
Sant Tukaram (1608–1649) was a celebrated 17th-century Marathi poet-saint of the Bhakti movement in Maharashtra. He was a central figure in the Varkari sect, a devotional tradition centered on the worship of Lord Vitthal (a form of Vishnu/Krishna) at Pandharpur. Tukaram composed thousands of devotional songs known as Abhangas, which expressed deep personal devotion and criticized social inequalities and caste rigidities.

2. Analysis of the Other Options:
- Surdas: A 16th-century devotional poet-saint from the Braj region of North India who wrote in Braj Bhasha and was a devotee of Lord Krishna (associated with the Pushtimarg tradition).
- Kabir: A 15th-century mystic poet-saint from Varanasi (Uttar Pradesh) who preached universal brotherhood and devotional spirituality through his famous Dohas (couplets).
- Tulsidas: A 16th-century saint and poet from Uttar Pradesh best known for composing the epic Ramcharitmanas in Awadhi, dedicated to Lord Rama.

Therefore, Sant Tukaram is the medieval Bhakti saint from Maharashtra who played a prominent role in the Varkari movement.