This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Which of the following is not true about non-randomized trials? 
Select and explain. 
A. Approach of comparability is high, B. Degree of comparability is high, C. The experiment can serve as its own control or can utilize a natural control, D. Several trials may be needed before evaluation is considered conclusive
B: Degree of comparability is high
Answer: B: Degree of comparability is high 
Explanation: Non-randomized trials ( i.e. Those depaing from strict randomization for practical purposes but in such a manner that non-randomization does not seriously affect the theoretical basis of conclusions ( refer pg 81, park 23 rd edition)