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: Microbiology
The following statements are true regarding botulism except 
Select and explain. 
A. Infant botulism is caused by ingestion of preformed toxin, B. Clostridium botulinum A, B, C and F cause human disease, C. The gene for botulinum toxin is encoded by a bacteriophage, D. Clostridium baratti may cause botulism
A: Infant botulism is caused by ingestion of preformed toxin
Answer: A: Infant botulism is caused by ingestion of preformed toxin 
Explanation: Infant botulism is caused by ingestion of spores of Clostridium botulinum in food which gets deposited in the gut and later produces toxin. Cases occur in infants below 6 months. Older children are not susceptible. The manifestations are constipation, poor feeding, lethargy, weakness, pooled oral secretions, weak or altered cry, floppiness and loss of head control. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 269