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: Social & Preventive Medicine
Tomatoes are rich in: 
Select and explain. 
A. Oxalic acid, B. Citric acid, C. Acetic acid, D. Formic acid
B: Citric acid
Answer: B: Citric acid 
Explanation: Citric acid