The correct option is D Harbert's pits
Trachoma is caused by the bacterium Chlamydia trachomatis and spread by poor hygiene, contaminated water, and houseflies. Acute trachoma is characterized by follicular conjunctivitis that is bilateral and more prominent on the superior tarsal conjunctiva. Follicles also appear at the limbus (the junction of the cornea and sclera of the eye). When these follicles heal, they form the pathognomonic cicatricial scar in the eye known as Herbert's pits. Thus, the correct answer is option C.