Mongo: Return specific fields from an array slice

I would like to return specific fields from an array in Mongo and am having trouble.

Let us say we have a document like such:

{
  "student":"Bob",
  "report_cards": [
    {
      "Year":2016,
      "English":"B",
      "Math":"A"
    },
    {
      "Year":2015,
      "English":"B",
      "Math":"A"
    }
  ]
}

I would like to return the following:

{"Student": "Bob", {"English":"B"}}

Basically, I only need the first element in the report cards array, and only return the English field.

I know it is something around:

db.collection.find({},{"Student":1, "report_cards":{$slice:1}});

But this, of course, results in the full array (year, english, math) returning. I have tried the following:

db.collection.find({},{"Student":1, "report_cards.$.english":{$slice:1}})
db.collection.find({},{"Student":1, "report_cards":{$slice:1, "$.english"}});

but those aren't correct.

How do I simply return one field from the obj within the array results?

Thank you!