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: Medicine
A 22-year-old man presents with diarrhea and intolerance to dairy products, on investigation he was found to have lactase deficiency. Agent least likely to cause lactose intolerance among these is? 
Select and explain. 
A. Condensed MILK, B. Skimmed Milk, C. Yoghu, D. Ice cream
D: Ice cream
Answer: D: Ice cream 
Explanation: Ans: D. Ice cream