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: Surgery
On colonoscopy which of the following is highly malignant - 
Select and explain. 
A. Single pedunculated polyp, B. Multiple flat polyp about hundreds, C. Multiple pedunculated polyp, D. Solitary flat polyp
B: Multiple flat polyp about hundreds
Answer: B: Multiple flat polyp about hundreds 
Explanation: • Also referred to as Bannayan-Zonana syndrome, Ruvalcaba-Riley smith syndrome, and Bannayan-Riley-Ruvalcaba syndrome.
• Characterized by hamartomatous polyposis and OLD HM-2.
OLD HM-2 :
• Ocular abnormalities, Lipomas, Developmental abnormalities.
• Hashimoto’s thyroiditis, Hyperpigmentation of penis.
• Macrocephaly, Mental retardation.
• No increased risk of colorectal carcinoma, other gastrointestinal or extraintestinal malignancy.