This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
A 30 year old woman with sudden right-sided painful red eye associated with nausea, vomiting and headache. The diagnosis is: 
Select and explain. 
A. Acute congestive glaucoma, B. Endophthlmitis, C. Eale's disease, D. Trachoma
A: Acute congestive glaucoma
Answer: A: Acute congestive glaucoma 
Explanation: A i.e. Acute congestive glaucoma