This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hyper Pigmented Disorders, Subject name: Dental
A lady came with complaints of a bluish lesion over left side of forehead and left eye. Shows irregular bluish lesion in left superior conjunctiva and forehead. What is most probable diagnosis ? 
Select and explain. 
A. Nevus of Ota, B. Nevus of Ito, C. Becker's nevus, D. Mongolian spot
A: Nevus of Ota
Answer: A: Nevus of Ota 
Explanation: Nevus of Ota: Unilateral bluish grey colour discolouration. Along ophthalmic and maxillary division of Trigeminal nerve. Naevus of ito- along acromioclavicular nerve (neck)Mongolian spots- Bluish discoloration in infants (MC site is lower back)Becker's nevus- Hyperpimented path with hyperichosis over upper trunk