Match list I with list II and select the correct answer from the code given below:
List-I (Acid) - List-II (Source)

A. Lactic acid - 1. Lemon
B. Acetic acid - 2. Rancid butter
C. Citric acid - 3. Milk
D. Butyric acid - 4. Vinegar

Code:
A B C D

A) 1 4 3 4

B) 3 4 1 2

C) 2 3 4 2

D) 3 2 3 1

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 1997 (GS Paper I)