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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Fishy odour syndrome which of the following is used in treatment
assistant
The correct answer is  Ref. Textbook of Biochemistry for Medical Students. Page. 467
 
Trimethylaminuria

Trimethylaminuria causes a strong body odour usually described as like rotting fish, faeces or garbage.
The odour is created when the body isn’t able to process trimethylamine.
This is a smelly chemical that’s produced in the gut, particularly when certain choline-rich foods are digested
It’s due to FMO3 gene defect
Riboflavin (vitamin B2) supplements to enhance any residual FMO3 enzyme activity.