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: Microbiology
Botulinum toxin causes? 
Select and explain. 
A. Tachycardia, B. Bilateral cranial nerve involvement, C. Fever, D. Hypertension
B: Bilateral cranial nerve involvement
Answer: B: Bilateral cranial nerve involvement 
Explanation: None