Mustard gas removes guanine from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine

Mustard gas, a deadly weapon used in WW-I – Deccan News

a
is one of the four nitrogenous bases in DNA.
b
directly causes mutations in DNA.
c
stores the building blocks of proteins.
d
produces energy for DNA replication.

a. is one of the four nitrogenous bases in DNA.