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A survey was conducted among 50 people on the "Dish for the Day" they wanted. It was found out that 28 wanted Adobo, 15 wanted Munggo and 20 wanted Kare-Kare. Furthermore, 8 wanted Adobo and Kare-Kare, 7 wanted Adobo and Munggo, 10 wanted Munggo and Kare-Kare and 4 wanted all the dishes. How many people wanted Adobo only?

a. 28

b. 17

c. 8

d. 7​