This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Ochronosis is seen in 
Select and explain. 
A. Phenol poisoning, B. Oxalic acid poisoning, C. Nitric acid poisoning, D. Sulphuric acid poisoning
A: Phenol poisoning
Answer: A: Phenol poisoning 
Explanation: Ochronosis It is the greenish black discoloration of tissues, mainly cailages, fibrous tissues, and sclera. It is seen in alkaptonuria. It can also occur due to exposure to various substances like phenol, trinitrophenol, resorcinol, hydroquinone, benzene, picric acid, mercurry or antimalarials. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 415