Match list-I with list-II and select the correct answer using the code given below the lists:
List-I (molecules) - List-II (elements present)

A. Vitamin B12 - 1. Magnesium
B. Haemoglobin - 2. Cobalt
C. Chlorophyll - 3. Copper
D. Brass - 4. Iron

Code:
A B C D

A) 2 4 1 3

B) 2 1 3 4

C) 4 1 2 3

D) 3 4 2 1

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2000 (GS Paper I)