This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
True regarding Staphylococcal food poisoning is - 
Select and explain. 
A. Caused by eating of dairy producrs, B. Caused by endotoxins, C. Caused by fishes, D. Associated with abnormal movements
A: Caused by eating of dairy producrs
Answer: A: Caused by eating of dairy producrs 
Explanation: Cows suffering from mastitis have been responsible for outbreak of staphylococcal food poisoning involving milk and milk products. The foods involved are salads, custards, milk and milk products which get contaminated by staphylococci. The illness becomes manifest by the sudden onset of vomiting, abdominal cramps and diarrhoea. PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition, page 238