Who is right? ....Many drs believe that there is no relation between acne & (nuts, choco, diary products....Etc) & others disagree!

Yes! You are right. There is controversy in the medical community in that regard. This is because there is no strong evidence to support or refute this association..
Biology ; Food. There are many health controversies but everything we eat has an impact on our health. Some folks bodies are better at excreting toxins and waste products than others. A dermatologist can give you good advice. A diet clean of transfats, low on carbs and sugar is best. Peace and good health.