This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Anatomy
The most common mode of transmission of brucella is 
Select and explain. 
A. Direct contact, B. Ingestion of raw milk, C. Air borne, D. Man to man
A: Direct contact
Answer: A: Direct contact 
Explanation: The organism from the infected animal enters the human body by direct contact. Through the wound, the conjunctiva, by inhalation or by ingestion of products from infected animals. The incubation period is usually about 10-30 days, but may sometimes be very prolonged. Ref: Textbook of microbiology; Ananthanarayana and paniker's; 10th edition; Pg: 346