  There is controversy regarding the nature of the suspected donor star to the
microquasar GRS 1915+105, and hence whether GRS 1915+105 is a high mass X-ray
binary (HMXB) or a low-mass X-ray binary (LMXB). In order to clarify this
issue, we obtained an infrared (J, H and K) spectrum of GRS 1915+105 in its low
state which shows a steeper continuum than the prototype X-ray binary Sco X-1.
We did not detect any HeII emission at 2.189 microns from GRS 1915+105 in our
quiescent spectrum, indicating that the line is transient and is only observed
during episodes of high X-ray activity. For our instrument configuration, there
is no detection of the 12CO lines which are characteristic of late-type stars
either in GRS1915+105 or Sco X-1.
